PURPOSE: To improve durability and safety by switching a main control valve corresponding to the movement of an electric joystick lever.

CONSTITUTION: A set of electric joystick levers (a) to (d) and a joystick device 1 to output a voltage signal corresponding to the movement of each electric joustick level are installed at a place distant from a working machine 3. Then, the voltage signal corresponding to the movement of the electric joystick levers (a) to (d) is outputted to en electric wire 6, and this voltage signal is inputted to an electromagnetic proportional valve control amplifier 5, and a control current is outputted to an electromagnetic proportional pressure reducing valve block 4, and electromagnetic proportional pressure reducing valves 41, 42 are driven. The electromagnetic proportional pressure reducing valves 41, 42 control delivery pressure proportionally by a control current value, and the main control valve 2 is changed over by this delivery pressure. Thus, a remote control device whose durability and safety were improved can be obtained.