A motor device is capable of improving relative positional accuracy of an output shaft relative to a rotary shaft with low cost. In the motor device (1), an opposite-to-output side support part of a motor frame (50) is provided with a first through hole (501a) for the rotary shaft (14), and a second through hole (501b) for holding a second bearing (382) supporting rotatablely an opposite-to-output side of an output shaft (30), and the first through hole (501a) is provided with a first bearing (381) supporting rotatablely the rotary shaft (14).