An apparatus (1) for opening and closing a lid (lid body) of a vehicle includes a linearly-movable shaft (10) supported by a housing (90) such that the shaft is linearly movable along, and nonrotatable around, an axial center (X10); and a rotary shaft (30) supported by the shaft such that it is linearly movable along and rotatable around the axial center. A stopper mechanism (50, 60) selectively blocks or permits the shaft to move from moving from a second position to a first position. The shaft has a main body (11) disposed within the rotary shaft (30) and an elastic body (80) provided on a terminal end portion of the main body (11). The elastic body includes a cushioning part (81) on a tip, a sealing part (83) around the main body, and a connecting part (85) connecting the cushioning part to the sealing part within the main body.