A geared motor may include a connector, a motor, a deceleration mechanism, an output shaft and a circuit board. The output shaft may include a rotation transmitted part driven by the deceleration mechanism, an external connection part which is disposed apart from the rotation transmitted to be connected with an external member, and a small diameter part formed between the rotation transmitted part and the external connection part. A part of the circuit board is disposed in a space between the rotation transmitted part and the external connection part, and an insertion opening of the connector is opened in a direction that the rotation transmitted part is disposed with respect to the external connection part.