PURPOSE: To surely fit the back face side of the frame of an electromagnetic contactor to rails provided in a case in an electromagnetic switch constituted of the electromagnetic contactor and a thermal relay.

CONSTITUTION: A stanchion 10 having a hook-like section 11 at the tip is planted adjacently to rails 6a, 6b on the inside bottom face of a case 3. The hook-like section 11 is coupled with the hook hole 9 of a slider 5 provided on the back face side of the frame of an electromagnetic contactor 1.