In an opening/closing operation device for a vehicle open/close door, a handle and a lever for transmitting an unlock operation force to a latch mechanism are turnably supported by an open/close door, and one end portion of the lever is brought into contact with a contact surface formed in the handle. In the contact surface, at least a portion to be in contact with the one end portion of the lever at an initial stage of the manipulation of the handle is formed in an inclined manner or curvedly: in a way that makes the portion situated more forward in a movement direction, in which the contact surface moves in response to the turn of the handle, as the portion comes closer to a rotary fulcrum of the lever in a direction along a plane orthogonal to the movement direction such that the portion intersects the plane.