A robot main body driving mechanism； a robot main body including a hollow flexible shaft, a joint portion including a bending joint and a proximal end continuous with a distal end of the flexible shaft, the bending joint receiving driving force of the robot main body driving mechanism to perform a bending operation, an end effector provided at a distal end of the joint portion, and a driving force transmission mechanism connecting the bending joint and the robot main body driving mechanism and configured to transmit the driving force of the robot main body driving mechanism to the bending joint； and a rotation driving mechanism configured to rotate the robot main body around an axis of a proximal end of the flexible shaft.
