Patent ID: 7439464

Claim:
A waterproof switch which includes: a cylindrical case; a plunger which is provided to the interior of the case by being movably supported in the case, and by protruding an end of the plunger out of the case, in order that the plunger can receive an external force; a spring, accommodated in the case, for applying a force to the plunger; and electrical contact point terminals provided to the plunger and the case, respectively, the waterproof switch which is configured to close the electrical contact point terminals when the external force causes the plunger to provide a predetermined amount of displacement against the spring, the waterproof switch comprising: a concave portion which is open to an end portion of the cylindrical case, and which forms a space in a circumference of the plunger, wherein the concave portion is provided with a seal for sealing the interstice between the case and the circumference of the plunger.