This waterproof switch (1) is provided with: a case part (6) and a cover part (7) which compose a waterproof case (2); and an operation section (3). Pressure within the waterproof case (2) changes according to the displacement of the operation section (3). The case part (6) is provided with: a case body (8) which consists of a non-elastic body not deformed by a change in pressure within the waterproof case (2) and which has a hole (8a); and an inner pressure adjustment section (9) which closes the hole (8a) and which is formed from an elastic body which can be deformed by a change in the inner pressure.
