SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 20-F/A

(Amendment No.1)

o

REGISTRATION STATEMENT PURSUANT TO SECTION 12(B) OR 12(G) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

x

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended March 31, 2007

OR

o

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 1-5238

Nihon Densan Kabushiki Kaisha

(Exact name of registrant as specified in its charter)

NIDEC CORPORATION

(Translation of Registrants name into English)

|Japan                                           | 338 Kuzetonoshiro-cho,
      Minami-ku, Kyoto 601-8205 Japan
|----------------------------------------------- | ------------------------------------------------------------
|(Jurisdiction of incorporation or organization) | (Address of principal executive offices)                    

Securities registered or to be registered pursuant to Section 12(b) of the Act:

|Title of Each Class | Name of Each Exchange On Which Registered
|------------------- | -----------------------------------------
|                    |                                          
|Common Stock*       | New York Stock Exchange                  

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

(Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

(Title of Class)

Indicate the number of outstanding shares of each of the issuers classes of capital or common stock as of the close of the period covered by the annual report.

As of March 31,  2007, 144,735,526 shares of common stock were
outstanding, including 8,125,004 shares represented by 32,500,016 American
Depositary Shares .

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes x   No o

If this report is an annual transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.  Yes o   No x

Indicate by check mark whether the registrant:  (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),
and (2) has been subject to such filing requirements for the past 90 days. Yes x   No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.  See definition of "accelerated filer and large accelerated filer" in Rule 12b 2 of the Exchange Act. (Check One):

Large accelerated filer  x   Accelerated filer  o    Non-accelerated filer  o

Indicate by check mark which financial statement item the registrant has elected to follow:

Item 17  o   Item 18x

If this is an annual report, indicated by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o   No x



*

Not for trading, but only in connection with the listing of the American
Depositary Shares, each representing one-fourth of one share of Common
Stock.



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Explanatory Note

Nidec Corporation hereby amends its annual report on Form 20-F for the year ended March 31, 2007 filed with the Securities and Exchange Commission on July 27, 2007, for the purpose of correcting the certifications of its Chief Executive and Chief Financial Officers which were included as Exhibits 12.1 and 12.2 thereto.  The corrected certifications, which are included as Exhibits 12.1 and 12.2 to this amendment, include paragraphs 1, 2, 4 and 5 as per the comment of the staff of the Securities and Exchange Commission which directed the filing of this amendment.



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PART III



Item 19. Exhibits.

|Exhibit Number | Description                                                             
|-------------- | ------------------------------------------------------------------------
|12.1           | Certification of the Chief Executive Officer required by Rule 13a-14(a)*
|12.2           | Certification of the Chief Financial Officer required by Rule 13a-14(a)*

____________

*       Paragragh 3 of the certification is not included as per the comment of the staff of the Securities and Exchange Commission.







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SIGNATURES





The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F/A and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.

|                         |  |  | NIDEC CORPORATION          |                                                                      
|------------------------ |  |  | -------------------------- | ---------------------------------------------------------------------
|                         |  |  |                            |                                                                      
|                         |  |  | By: /s/ Shigenobu Nagamori |                                                                      
|                         |  |  | Name:                      | Shigenobu Nagamori                                                   
|                         |  |  | Title:                     | President, Chief Executive Officer and
       Representative Director
|Date:  November 30, 2007 |  |  |                            |