To provide a vehicle door opening/closing device arranged to pivotally connect a vehicle body and a door with a hinge member and provided with a damper arranged to impart a braking force to the door when the door is turned, the damper being directly connected to the hinge member, the hinge member includes a first hinge arm fixed to a floor, a pin shaft fixed to the first hinge arm and extending outward of the first hinge arm, and a second hinge arm pivotally mounted on the pin shaft and fixed to a lower end of a lower door, and the damper includes a rotors connected to a projecting portion of the pin shaft, a housing rotatably mounted on the rotor and fixed to the lower door, and a braking means contained in the housing to impart a braking force to the housing when the housing is rotated relative to the rotor.