PURPOSE: To propose a contactless control device for an electric tool excellent in power consumption, and easily assembled as an assembly into the drive mechanism of an electronic control type and an existing electronic circuit.

CONSTITUTION: An additional ohmic resistor 10 is selectively connected in parallel to partial resistors 6 and 7 by a Hall switch 9 for switching action parameter, decided by partial resistors 6 and 7 in a stabilized power source in contactless, to feed electric power to the Hall switch 9 via a Zener diode 13 connected in series to the stabilized power source. A switch circuit including the Hall switch 9 is connected to the connecting points 11 of the partial resistors 6 and 7 via a diode 19, to connect the resistor 10 to a pre-resistor 18 selectively in parallel to the resistors 6 and 7 by the switch circuit.