PURPOSE: To miniaturize an electric machining device and to shorten its overall length by supporting a motor main body on both sides of a cylindrical body arranged on the outside of the motor main body and installing an air cylinder part furnished with a guide block with legs on a lower part of the cylindrical body.

CONSTITUTION: An air cylinder part 13 is installed on the outside of a motor main body 12. Integrally structured guide blocks 34, 35 with legs are provided on both sides of this air cylinder part 13. An electric maching device is easily installed at a specified position by inserting a bot, etc., in screw holes 45, 46 formed on these guide blocks 34, 35 with the legs. The both sides of the air cylinder part 13 are fixed by the fixed guide blocks 34, 35 with the legs, and its inside is made to move longitudinally by movement of the air cylinder 13 by an electric motor. Consequently, the overall length of this electric machining device is shortened.