A vehicle door opening/closing device includes: an inside handle mounted to a vehicle door and operated from a vehicle interior to perform a door opening/closing operation; an outside handle mounted to the door and operated from a vehicle exterior to perform the door opening/closing operation; a locking mechanism actuated to lock the door at a predetermined position; an open mechanism; a release mechanism; and a cancel mechanism. The open mechanism is actuated according to operation of the inside and outside handles to release the lock by the locking mechanism. The release mechanism includes an electric motor and a power-transmission member transmitting electric motor power to the open mechanism, and actuates the open mechanism to release the lock of the door. Further, the cancel mechanism is actuated by operating the inside and outside handles to interrupt transmission of the electric motor driving force to the open mechanism by the power-transmission member.