A body movement assistance apparatus comprising: a pulley configured to wind or unwind a wire which is connectable to a cover (120, 130, 140) to be worn on a specific body part to limit a movement of the specific body part between a first position and a second position; a motor configured to rotate the pulley in forward and reverse directions such that the wire is wound around or unwound from the pulley; and a stopper device configured to limit the winding or unwinding of the wire such that, when the wire is connected to the cover (120, 130, 140), the specific body part does not deviate from between the first position and the second position, characterised in that the stopper device includes: a pulley hook protruding from one side of the pulley to form a turning trajectory depending on the rotation of the pulley; a disk (43a, 43b) having a disk track (45a, 45b) to which the pulley hook is movably coupled, the disk track (45a, 45b) having a predetermined arc length and corresponding to the turning trajectory of the pulley hook, wherein the disk (43a, 43b) has, on a planar surface thereof, a disk hook (47a, 47b) formed at a position corresponding to the pulley hook; and a stopper having a stopper track to which the disk hook (45a, 45b) is movably coupled, the stopper track having a predetermined arc length along the turning trajectory of the pulley hook, wherein the disk (43a, 43b) is provided between the pulley and the stopper so as to be rotatable and configured to adjust a movement range of the specific body part between the first position and the second position. a pulley configured to wind or unwind a wire which is connectable to a cover (120, 130, 140) to be worn on a specific body part to limit a movement of the specific body part between a first position and a second position; a motor configured to rotate the pulley in forward and reverse directions such that the wire is wound around or unwound from the pulley; and a stopper device configured to limit the winding or unwinding of the wire such that, when the wire is connected to the cover (120, 130, 140), the specific body part does not deviate from between the first position and the second position, characterised in that the stopper device includes: a pulley hook protruding from one side of the pulley to form a turning trajectory depending on the rotation of the pulley; a disk (43a, 43b) having a disk track (45a, 45b) to which the pulley hook is movably coupled, the disk track (45a, 45b) having a predetermined arc length and corresponding to the turning trajectory of the pulley hook, wherein the disk (43a, 43b) has, on a planar surface thereof, a disk hook (47a, 47b) formed at a position corresponding to the pulley hook; and a stopper having a stopper track to which the disk hook (45a, 45b) is movably coupled, the stopper track having a predetermined arc length along the turning trajectory of the pulley hook, wherein the disk (43a, 43b) is provided between the pulley and the stopper so as to be rotatable and configured to adjust a movement range of the specific body part between the first position and the second position. a pulley hook protruding from one side of the pulley to form a turning trajectory depending on the rotation of the pulley; a disk (43a, 43b) having a disk track (45a, 45b) to which the pulley hook is movably coupled, the disk track (45a, 45b) having a predetermined arc length and corresponding to the turning trajectory of the pulley hook, wherein the disk (43a, 43b) has, on a planar surface thereof, a disk hook (47a, 47b) formed at a position corresponding to the pulley hook; and a stopper having a stopper track to which the disk hook (45a, 45b) is movably coupled, the stopper track having a predetermined arc length along the turning trajectory of the pulley hook, wherein the disk (43a, 43b) is provided between the pulley and the stopper so as to be rotatable and configured to adjust a movement range of the specific body part between the first position and the second position.