A motor device may include a motor main body provided with a stator part and a rotation shaft, an output shaft provided with a lead screw part, a motor frame provided with an opposite-to-output side support part that supports the stator part and an opposite-to-output side of the output shaft, and which is provided with an output side support part which supports an output side of the output shaft, and a gear part for transmitting a driving force of the rotation shaft to the output shaft. The opposite-to-output side support part rotatably supports the rotation shaft and further rotatably supports the opposite-to-output side of the output shaft.