| 摘要 |
A switch storing chamber (8) of a membrane switch is communicated with the exterior and no water droplet enters the switch storing chamber (8). At least one upper gas permeable chamber (5c) (5d) is formed between an upper membrane sheet (2) and a spacer sheet (3) by surrounding a peripheral portion of this upper gas permeable chamber by adhesive material layers (9) (13), and at least one lower gas permeable chamber (5a) (5b) is formed between a lower membrane sheet (4) and the spacer sheet (3) by surrounding a peripheral portion of this lower gas permeable chamber by the adhesive material layers (9) (13). The upper gas permeable chamber (5c) (5d) and the lower gas permeable chamber (5a) (5b) partially overlap each other in a vertical direction and communicate with each other by a gas permeable hole (15) of the spacer sheet (3) bored in an overlapping position so that a gas permeable passage (5) vertically curved in a zigzag shape is formed. One side of the gas permeable passage (5) communicates with the exterior and the other side communicates with the switch storing chamber (8). The gas permeable passage (5) communicates the switch storing chamber (8) with the exterior and is vertically curved in a complicated zigzag shape through the spacer sheet (3) so that a water droplet entering from the exterior is interrupted.
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