A window regulator device including an object pinching detection unit which includes an input-side rotational member; an output-side rotational member coupled to an output shaft; an elastic member interposed between the input-side rotational member and the output-side rotational member; a cam formed respectively on opposed surfaces of the input-side rotational member and the output-side rotational member; and an object pinching detection switch for performing a switching operation based on the axial movement of the output-side rotational member.