A vehicle drive device comprising: a rotary electric machine (MG) that serves as a driving force source for wheels (W); a first rotation member (RT1) coupled to a rotor (Ro) of the rotary electric machine (MG); and a fluid coupling (TC) that is disposed on an axial first side (L1), which is one side in an axial direction (L) with respect to the rotary electric machine (MG), and that has a rotation housing , wherein a plurality of fastening portions is provided in the first rotation member (RT1) and the rotation housing along a circumferential direction (C), the first rotation member (RT1) and the rotation housing are fastened by a fastening member (F2) at each of the plurality of fastening portions , and each of the plurality of fastening portions has a first fastening hole (H1) that is formed in the first rotation member (RT1) along the axial direction (L) and in which the fastening member (F2) is inserted, and a second fastening hole (H2) that is formed in the rotation housing along the axial direction (L) and in which the fastening member (F2) is inserted, characterized in that a locked portion is provided on an outer peripheral portion of one of the first rotation member (RT1) and the rotation housing , a locking portion is provided on an outer peripheral portion of the other of the first rotation member (RT1) and the rotation housing , the locking portion is inserted in the axial direction (L) with respect to the locked portion and is locked so that a relative rotation in the circumferential direction (C) is restricted with respect to the locked portion , and the first fastening hole (H1) and the second fastening hole (H2) are disposed so as to overlap with each other when viewed in the axial direction along the axial direction (L) in a state in which the locking portion is locked to the locked portion . a rotary electric machine (MG) that serves as a driving force source for wheels (W); a first rotation member (RT1) coupled to a rotor (Ro) of the rotary electric machine (MG); and a fluid coupling (TC) that is disposed on an axial first side (L1), which is one side in an axial direction (L) with respect to the rotary electric machine (MG), and that has a rotation housing , wherein a plurality of fastening portions is provided in the first rotation member (RT1) and the rotation housing along a circumferential direction (C), the first rotation member (RT1) and the rotation housing are fastened by a fastening member (F2) at each of the plurality of fastening portions , and each of the plurality of fastening portions has a first fastening hole (H1) that is formed in the first rotation member (RT1) along the axial direction (L) and in which the fastening member (F2) is inserted, and a second fastening hole (H2) that is formed in the rotation housing along the axial direction (L) and in which the fastening member (F2) is inserted, characterized in that a locked portion is provided on an outer peripheral portion of one of the first rotation member (RT1) and the rotation housing , a locking portion is provided on an outer peripheral portion of the other of the first rotation member (RT1) and the rotation housing , the locking portion is inserted in the axial direction (L) with respect to the locked portion and is locked so that a relative rotation in the circumferential direction (C) is restricted with respect to the locked portion , and the first fastening hole (H1) and the second fastening hole (H2) are disposed so as to overlap with each other when viewed in the axial direction along the axial direction (L) in a state in which the locking portion is locked to the locked portion . <EOS>