| 摘要 |
PROBLEM TO BE SOLVED: To provide a membrane switch having an excellent waterproof. SOLUTION: In a membrane switch where at least one air leakage aperture 60 is formed in an upper circuit board 10 or a lower circuit substrate 20 or both boards 10, 20 along with inserting a spacer part 30 between the upper circuit board 10 and the lower circuit board 20, the membrane switch is that an equivalent outer diameter of the air leakage aperture 60 is 0.02-2 mm and the equivalent outer diameter is 0.2-50 times the distance to the surface of the spacer part 30 opposed to the air leakage aperture 60 from a substrate sheet surface into which the air leakage aperture 60 is formed. It can obtain an excellent waterproof properties and an operation with high stability and reliability from these relations.
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