To simplify the operation to cover an operational member with a covering body and to shorten the time of assemblage.

An element 14, to which terminals 15 are attached, is mounted on an operational part 12e, which is integrally formed with a case 12. At this time, the element 14 is mounted on the operational part 12e stably without swinging. And as the element 14 is covered with a covering body 13 from above and the case 12 and the covering body 13 can be welded by heat and assembled, parts count can be reduced and the assemblage power is preferable in this pressure broken member.