To provide a switch which does not generate switch on-off timing lag with a strong fixing strength construction between an outer case and an inner case, strong enough not to generate looseness.

The switch is provided with: the inner case 10 accommodating fixed contacts 40, 50 and a movable contact 60 which contacts and separates between the fixed contacts 40, 50; a cover 80 which has a through-hole for an operation lever 83; the outer case 100 where terminals 43, 53 of inner case 10 accommodated inside are made to project from a bottom face and; an operation knob 150 including an operation lever 190 which is arranged on a top part of the cover 80 and axially supported to the outer case 100 rocking-free to operate the movable contact 60. In a state where a bottom face of the inner case 10 contacts an inner bottom face of the outer case 100, the inner case 10, the cover 80 and the outer case 100 are unified by the way of a pressing member 130 fixed to the outer case 100 and arranged across inside of an inner case accommodation part 101 pushing a top face of the cover 80 against the inner case 10.