PURPOSE:To apply even for various works under severe working environments of the outdoor, etc. and the work requiring power by providing a magnetostrictive phenomenon displacement sensor equipped with a cable transmitting to an electronically controlled unit the positional signal detected by the mutual movement of a magnet and sensor probe bar. CONSTITUTION:When a pulse signal is given toward a sensor probe bar 21 from the probe head 22 which forms a magnetostrictive phenomenon displacement sensor, the positional signal detected by the relative movement of the magnet 24 and sensor probe bar 21 fixed to a piston rod 27 is propagated as a sound wave along the sensor probe bar, by the movement of the piston 26 which is slidably freely inserted to the inner part of a cylinder tube 25 and input to an electronically controlled unit via a cable 23 as a positional signal from the head. This unit operates this positional signal by comparing with a set value, controlling by driving the working state of each cylinder via a hydraulic control valve and controlling many joints by operating in a set state.
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