PURPOSE: To mount two switches on a mount table without using any adjustment table so as to shorten a time required for assembling work by vertically spacing a first and second layer pins of a locking device from each other at the time of non-energization of the two switches locked each other and having a shape different from each other.

CONSTITUTION: At the time of non-energization of two switches 1 and 2 locked each other and having a shape different from each other, a first and second lever pins 1106a and 1206a of a locking device 1003 are vertically spaced from each other. Consequently, even if there is a difference between a distance from the lever pin engaging portion of a cross bar of the switch 1 to the mounting surface of the switch 1 and a distance from the lever pin engaging portion of a cross bar of the switch 2 to the mounting surface of the switch 2, the difference can be adjusted. Therefore, the two switches 1, 2 can be mounted on a mount table 5 without using any adjustment table, thus shortening a time required for assembling work.