Joint Filing Agreement

                                    Exhibit D
                                    ---------

                             Joint Filing Agreement

         In accordance with Rule 13d-1(f) of the Securities Exchange Act of
1934, as amended, the undersigned hereby agree to the joint filing on behalf of
each of us of a Schedule 13D relating to the ordinary shares, no par value, of
Ducati Motor Holding S.p.A., an Italian company, and that any subsequent
amendments thereto filed by any of us will be filed on behalf of each of us.
This Agreement may be included as an exhibit to such joint filing.

Dated: April 6, 2006


                                  BI-INVEST INTERNATIONAL HOLDINGS LIMITED
                                  By: MONTAGE EAST LIMITED, Director & President
                                  By: /s/ Xxxxxx Xxxxxxxxxx
                                      -------------------------
                                  Name: Xxxxxx Xxxxxxxxxx, Authorized Signatory

                                  INVESTINDUSTRIAL HOLDINGS LIMITED
                                  By: /s/ Xxxxxx Xxxxxx
                                      ---------------------
                                  Name:  Xxxxxx Xxxxxx
                                  Title: Director

                                  INVESTINDUSTRIAL PARTNERS LIMITED
                                  By: /s/ Xxxxxxxxxxx Xx Xxxxxxxxxx
                                      ---------------------------------
                                  Name:  Xxxxxxxxxxx Xx Xxxxxxxxxx
                                  Title: Director

                                  INVESTINDUSTRIAL III, L.P.
                                  By: INVESTINDUSTRIAL PARTNERS LIMITED,
                                      its General Partner

                                  By: /s/ Xxxxxxxxxxx Xx Xxxxxxxxxx
                                      ---------------------------------
                                  Name:  Xxxxxxxxxxx Xx Xxxxxxxxxx
                                  Title: Director

                                  WORLD MOTOR HOLDINGS S. a x.x.

                                  By: /s/ Emmanuel Famerie
                                      ------------------------
                                  Name:  Emmanuel Famerie
                                  Title: Manager



                                  WORLD MOTORS S.A.

                                  By: /s/ Emmanuel Famerie
                                      ------------------------
                                  Name:  Emmanuel Famerie
                                  Title: Director

                                  WORLD MOTORS WHITE S.c.A.
                                  By: WORLD MOTORS S.A., its Manager

                                  By: /s/ Emmanuel Famerie
                                      ------------------------
                                  Name:  Emmanuel Famerie
                                  Title: Director

                                  WORLD MOTORS RED S.c.A.
                                  By: WORLD MOTORS S.A., its Manager

                                  By: /s/ Emmanuel Famerie
                                      ------------------------
                                  Name:  Emmanuel Famerie
                                  Title: Director

                                  EFG TRUST COMPANY LIMITED, in its capacity as
                                  trustee of The Xxxxx Xxxxxx Declaration of
                                  Trust
                                  By: /s/ X. Xx Xxxxxxxxx
                                      -----------------------
                                  Name:  X. Xx Xxxxxxxxx
                                  Title: Authorized Signatory

                                  By: /s/ X. Xxxx
                                      ---------------
                                  Name:  X. Xxxx
                                  Title: Authorized Signatory

                                  EQ TRUST (JERSEY) LIMITED, in its capacity as
                                  trustee of the Budda Trust

                                  By: /s/ Xxxxxxxxx Xxxxx
                                      -----------------------
                                  Name:  Xxxxxxxxx Xxxxx
                                  Title: Authorized Signatory

                                  By: /s/ Xxx Xxxxx
                                      -----------------
                                  Name:  Xxx Xxxxx
                                  Title: Authorized Signatory



                                  BS PRIVATE EQUITY S.p.A.

                                  By: /s/ Xxxxxxx Xxxxxxxxx
                                      -------------------------
                                  Name:  Xxxxxxx Xxxxxxxxx
                                  Title: Chairman

                                  BS INVESTIMENTI S.G.R. S.p.A., acting in its
                                  capacity as manager of the fund "BS
                                  Investimenti IV"

                                  By: /s/ Xxxxxxx Xxxxxxxxx
                                      -------------------------
                                  Name:  Xxxxxxx Xxxxxxxxx
                                  Title: Chairman

                                  HOSPITALS OF ONTARIO PENSION PLAN

                                  By: /s/ Xxx Xxxxxx
                                      ------------------
                                  Name:  Xxx Xxxxxx
                                  Title: Senior Portfolio Manager, Private
                                         Equity & Special Situations

                                  By: /s/ Xxxxxx Xxxxxxx
                                      ----------------------
                                  Name:  Xxxxxx Xxxxxxx
                                  Title: Vice President, Private Equity &
                                         Special Situations