A compact geared motor unit, capable of properly protecting an electric motor without disengaging gears or suspending the unit, even when a thrust force larger than an allowable value is generated. The geared motor unit 10 has an electric motor and a gear configured to generate a thrust force applied to the electric motor when transmitting a torque, and a control section for controlling the electric motor. The control section has a thrust load obtaining part which obtains a thrust load of the electric motor at predetermined timings or time intervals; a critical thrust load storing part which stores a critical thrust load of the electric motor; and a torque limiting part which electrically limits the torque of the electric motor when the obtained thrust load exceeds the stored critical thrust load.
