[logo - American Funds(r)]
                          Capital Income Builder, Inc.
                             333 South Hope Street
                         Los Angeles, California 90071
                              Phone (213) 486-9200


                                  CERTIFICATION

I, James B. Lovelace, certify that:

1.   I have reviewed this report on Form N-Q of Capital Income Builder, 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 schedules of investments included in this report
     fairly present in all material  respects the  investments of the registrant
     as of the end of the fiscal quarter for which this report is filed;

4.   The  registrant's  other  certifying  officer(s) and I are  responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in rule  30a-3(c)  under the  Investment  Company Act of 1940) and internal
     control over  financial  reporting (as defined in Rule  30a-3(d)  under the
     Investment Company Act of 1940) for the registrant 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 registrant,  including its
     consolidated  subsidiaries,  is made  known to us by  others  within  those
     entities,  particularly  during the  period in which  this  report is being
     prepared;

     b) Designed such internal control over financial reporting,  or caused such
     internal  control  over  financial  reporting  to  be  designed  under  our
     supervision,  to provide reasonable  assurance regarding the reliability of
     financial  reporting  and  the  preparation  of  financial  statements  for
     external  purposes  in  accordance  with  generally   accepted   accounting
     principles;

     c) Evaluated the effectiveness of the registrant's  disclosure controls and
     procedures  and  presented  in  this  report  our  conclusions   about  the
     effectiveness  of the  disclosure  controls  and  procedures,  as of a date
     within  90 days  prior  to the  filing  date of this  report  based on such
     evaluation; and

     d) Disclosed in this report any change in the registrant's internal control
     over financial  reporting that occurred during the registrant's most recent
     fiscal quarter that has  materially  affected,  or is reasonably  likely to
     materially  affect,  the  registrant's   internal  control  over  financial
     reporting; and

5.   The registrant's  other  certifying  officer(s) and I have disclosed to the
     registrant's  auditors and the audit committee of the registrant'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  registrant'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 registrant's  internal control
     over financial reporting.


Date: September 28, 2005

/s/ James B. Lovelace
------------------------------------
James B. Lovelace, Vice Chairman and
Principal Executive Officer
Capital Income Builder, Inc.


<PAGE>


                           [logo - American Funds(r)]
                          Capital Income Builder, Inc.
                             333 South Hope Street
                         Los Angeles, California 90071
                              Phone (213) 486-9200


                                  CERTIFICATION

I, Sheryl F. Johnson, certify that:

1.   I have reviewed this report on Form N-Q of Capital Income Builder, 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 schedules of investments included in this report
     fairly present in all material  respects the  investments of the registrant
     as of the end of the fiscal quarter for which this report is filed;

4.   The  registrant's  other  certifying  officer(s) and I are  responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in rule  30a-3(c)  under the  Investment  Company Act of 1940) and internal
     control over  financial  reporting (as defined in Rule  30a-3(d)  under the
     Investment Company Act of 1940) for the registrant 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 registrant,  including its
     consolidated  subsidiaries,  is made  known to us by  others  within  those
     entities,  particularly  during the  period in which  this  report is being
     prepared;

     b) Designed such internal control over financial reporting,  or caused such
     internal  control  over  financial  reporting  to  be  designed  under  our
     supervision,  to provide reasonable  assurance regarding the reliability of
     financial  reporting  and  the  preparation  of  financial  statements  for
     external  purposes  in  accordance  with  generally   accepted   accounting
     principles;

     c) Evaluated the effectiveness of the registrant's  disclosure controls and
     procedures  and  presented  in  this  report  our  conclusions   about  the
     effectiveness  of the  disclosure  controls  and  procedures,  as of a date
     within  90 days  prior  to the  filing  date of this  report  based on such
     evaluation; and

     d) Disclosed in this report any change in the registrant's internal control
     over financial  reporting that occurred during the registrant's most recent
     fiscal quarter that has  materially  affected,  or is reasonably  likely to
     materially  affect,  the  registrant's   internal  control  over  financial
     reporting; and

5.   The registrant's  other  certifying  officer(s) and I have disclosed to the
     registrant's  auditors and the audit committee of the registrant'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  registrant'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 registrant's  internal control
     over financial reporting.


Date: September 28, 2005

/s/ Sheryl F. Johnson
--------------------------------
Sheryl F. Johnson, Treasurer and
Principal Financial Officer
Capital Income Builder, Inc.