A robot system including a robot that is controlled by a robot controller and a wireless communication device that is worn or carried by a person present in the periphery of the robot. The wireless communication device has a sensor capable of detecting an acceleration, the wireless communication device is configured to transmit information related to the acceleration to the robot controller of the robot in a state in which the wireless communication device is not operated by the person, and the robot controller performs operation restriction of the robot when the acceleration exceeds a threshold.