FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                        Report of Foreign Private Issuer


                      Pursuant to Rule 13a-16 or 15d-16 of
                       the Securities Exchange Act of 1934


                         For the month of December, 2005

                         Commission File Number 1-15236

                              Advantest Corporation
                              ---------------------
                 (Translation of Registrant's Name Into English)

                         Shin Marunouchi Center Building
                         -------------------------------
                                1-6-2, Marunouchi
                                -----------------
                                   Chiyoda-ku
                                   ----------
                                 Tokyo 100-0005
                                 --------------
                                      Japan
                                      -----
                    (Address of Principal Executive Offices)


         Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F. Form 20-F X   Form 40-F
                                                        ---           ---

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(1): ___________

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(7): ___________

         Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934. Yes     No X
         ---    ---

         If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): ___________





Materials Contained in this Report:

1.     Executive summary of the registrant's Japanese-language Interim
       Securities Report, which was submitted to the Chief of the Kanto Local
       Finance Bureau of the Ministry of Finance of Japan on December 20, 2005.

2.     English-language translation of the registrant's Interim Consolidated
       Financial Statements for the six-month period ended September 30, 2005,
       which was filed with the Chief of the Kanto Local Finance Bureau as part
       of the registrant's Interim Securities Report.





                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.




                                           Advantest Corporation



                                           By: /s/ Hitoshi Owada
                                               ---------------------------------
                                               Name:  Hitoshi Owada
                                               Title: Director and
                                                      Managing Executive Officer


Date:  December 20, 2005