This operation input equipment operation input equipment (2) is a kind of for inputting operation instruction and manipulator (3) observation or treatment affected part. There is provided a kind of operation input equipment (2) includes: that handle portion (25) by operator holds (zero) and his/her hand The handle portion (25) is movably supported with arm (22), wherein the arm (22) includes at least two Chain elements, with at least one connector (J1, J2, and J3) tiltably about joint axis intersects their longitudinal axis to connection adjacent pair connecting component, and each connector (J1 include J3 with J2). Sensor, what each connecting component for detecting Relative angular displacement linked each other Part occurs with friction, is configured as generating the opposite direction in friction torque direction to apply torque.
