A face image acquisition system which has a robot and a motion controller, the robot includes a camera and a arm, the motion controller has a visitor detector, a directive generator, and a face image registration unit, in the motion controller, a directive which controls the motion of the robot is generated by the directive generator and is transmitted to the robot when the visitor is detected by the visitor detector, and the robot offers a handshake to the visitor in compliance with the directive, and the robot acquires the face image of the visitor during the handshake with the visitor, and the acquired face image is stored in the face image registration unit.