Exhibit 31.1

#### CERTIFICATIONS

I, Kam Shah certify that:

|   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                            
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|1. |  | I have reviewed this annual report on Form 20-F of Bontan Corporation Inc.                                                                                                                                                                                                                                                                                                                                                                             
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|2. |  | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;                                                                                                                                             
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|3. |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;                                                                                                                                                                   
|  
|4. |  | I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) [omitted pursuant to Transition Period provisions at Section III of Release 34-47986 of the Securities and Exchange Commission entitled "Management's Reports on Internal Control over Financial Reporting and Certification of Disclosure in Exchange Act Periodic Reports"] for the company and have:
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|   |  | a)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to me by others within those entities, particularly during the period in which this report is being prepared;
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|   |  | b)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | [omitted pursuant to Transition Period provisions at Section III of Release 34-47986 of the Securities and Exchange Commission entitled "Management's Reports on Internal Control over Financial Reporting and Certification of Disclosure in Exchange Act Periodic Reports"];                                                                                             
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|   |  | c)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Evaluated the effectiveness of the company's disclosure controls and procedures and presented in this report my conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and                                                                                            
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|   |  | d)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Disclosed in this report any change in the company's internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company's internal control over financial reporting; and                                                                       
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|5. |  | I have disclosed, based on my most recent evaluation of internal control over financial reporting, to the company's auditors and the audit committee of the company's board of directors (or persons performing the equivalent functions):                                                                                                                                                                                                             
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|   |  | a)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company's ability to record, process, summarize and report financial information; and                                                                                                     
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|   |  | b)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Any fraud, whether or not material, that involves management or other employees who have a significant role in the company's internal control over financial reporting.                                                                                                                                                                                                    

Date:  August 11, 2004

/s/   Kam Shah
Chief Executive Officer (May 17, 2004 to the date of this report) and Chief Financial Officer

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Exhibit 31.2

#### CERTIFICATIONS

I, Terence Robinson certify that:

|   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                            
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|1. |  | I have reviewed this annual report on Form 20-F of Bontan Corporation Inc.                                                                                                                                                                                                                                                                                                                                                                             
|  
|2. |  | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;                                                                                                                                             
|  
|3. |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;                                                                                                                                                                   
|  
|4. |  | I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) [omitted pursuant to Transition Period provisions at Section III of Release 34-47986 of the Securities and Exchange Commission entitled "Management's Reports on Internal Control over Financial Reporting and Certification of Disclosure in Exchange Act Periodic Reports"] for the company and have:
|  
|   |  | a)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to me by others within those entities, particularly during the period in which this report is being prepared;
|  
|   |  | b)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | [omitted pursuant to Transition Period provisions at Section III of Release 34-47986 of the Securities and Exchange Commission entitled "Management's Reports on Internal Control over Financial Reporting and Certification of Disclosure in Exchange Act Periodic Reports"];                                                                                             
|  
|   |  | c)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Evaluated the effectiveness of the company's disclosure controls and procedures and presented in this report my conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and                                                                                            
|  
|   |  | d)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Disclosed in this report any change in the company's internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company's internal control over financial reporting; and                                                                       
|  
|5. |  | I have disclosed, based on my most recent evaluation of internal control over financial reporting, to the company's auditors and the audit committee of the company's board of directors (or persons performing the equivalent functions):                                                                                                                                                                                                             
|  
|   |  | a)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company's ability to record, process, summarize and report financial information; and                                                                                                     
|  
|   |  | b)                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Any fraud, whether or not material, that involves management or other employees who have a significant role in the company's internal control over financial reporting.                                                                                                                                                                                                    

Date:  May 17, 2004

/s/   Terence Robinson
Chief Executive Officer