PURPOSE: To provide a case with a structure of preventing an insulating cutting chip from being produced which is a main cause of improper contact in the case of assembly.

CONSTITUTION: In an electromagnetic relay, a drive part 2 is fitted to be inserted to a tubular case 3 formed of insulating material to provide contact springs 11. The case 3 comprises two case constitutional members 34 of plane viewed U shape provided with a recessed part 32 and a protruded part 33 in both side minor axis parts 31, to provide constitution so as to connect the protruded part 33, provided in the one case constitutional member 34, fitted to the recessed part 32 provided in the other case constitutional member 34.