A robot system includes a work bench on which a work piece is placed, and a robot device. The robot device includes: a base and an arm section that has torsional rotatability around a first axis approximately along a center line of the base, bending rotatability around a second axis that is orthogonal to the first axis, and linear extensibility and retractability along a third axis that is orthogonal to the second axis. Work is performed in collaboration with a worker on the work piece by means of an end effector that is mounted at a tip of the arm section. The base is disposed so that a moveable region of the arm section accompanying rotation around the first axis and the second axis and linear extension and retraction along the third axis overlaps with a working region of the worker.
