The present invention provides a switch which allows a communication module to be made waterproof while maintaining a switch function. A wireless switch device 1 which functions as a rocker switch includes a cover member 40 and an elastic waterproof member 20 both of which seal an opening 37 of a casing member 30 in a state in which a wireless switch module 10 is housed in the casing member 30. The wireless switch device 1 further includes a seesaw-shaped member 50 which is arranged on an outer side of the cover member 40 and the waterproof member 20 which outer side is opposite to a side on which the wireless switch module 10 is sealed with the cover member 40 and the waterproof member 20.