A vehicle door opening/closing device, which enhances the operation feeling during opening and closing of a vehicle door, includes: an outside door handle provided to a power sliding door for opening and closing a door opening, the outside door handle being supported to move between an initial position and a maximum movement position relative to the power sliding door, and being operated to open and close the power sliding door; a spring unit urging the outside door handle to move from the maximum movement position to the initial position; an opening/closing operation detection unit for detecting movement of the outside door handle from the maximum movement position to the initial position; a door drive mechanism for driving the opening and closing of the power sliding door; and a control unit for actuating the door drive mechanism on the basis of a detection signal outputted from the opening/closing operation detection unit.