A vehicle for attaching to a rear end of a vehicle includes a bumper body and a retractable step which includes a mounting base coupled at the bumper body, a step member, and a locking unit. The step member includes a step platform and a swing arm coupled between the mounting base and the step platform. The step member is actuated to move between a retracted position and an extended position. At the retracted position, the swing arm is pivotally and inwardly folded to move the step platform underneath the bumper body, and at the extended position, the swing arm is pivotally and outwardly folded to move the step platform out of the bumper body. The locking unit is arranged to lock up the step member at the retracted position and the extended position.