Provided are a working robot and a robot system serving as a type coexisting with humans and improving reliability in safety. The working robot includes an arm, a driving mechanism, and a controller. The arm includes a plurality of link members that are coupled rotatably around shafts. The driving mechanism includes a driving source, and a plurality of power transmission paths capable of transmitting motive power from the driving source to the link members with mutually different numbers of revolutions or torques. The controller switches the power transmission paths, based on a sensing result for a moving object including a human body in a certain area.
