VEHICLE DRIVING DEVICE

A rotor support member (2) includes: a tubular portion (21) having a tubular shape extending along an axial direction (L) and supporting a rotor (Ro) of a rotary electric machine (MG); and a flange portion (22) provided to extend along a radial direction (R) on an inner side (R1) in the radial direction (R) with respect to the tubular portion (21) at a position adjacent to a first engagement device (CL1) on a first side (L1) in the axial direction, and connected to the tubular portion (21). The flange portion (22) includes a cylinder forming portion (23) protruding to the first side (L1) in the axial direction so as to form a cylinder portion (C2) on which a first piston portion (52) of the first engagement device (CL1) slides. A rotation sensor (3) includes a rotating body (31) supported by an outer peripheral surface of the cylinder forming portion (23) on an outer side (R2) in the radial direction, and a fixed body (32) disposed on the outer side (R2) in the radial direction with respect to the rotating body (31).