Breathable waterproof plug and pressure switch

Abstract

A breathable waterproof plug (32) is provided with a first opening (44) and a second opening (46) in a main body part (34) of the breathable waterproof plug (32), the first opening is communicated with the internal space of a protruding part (36) and reaches a first surface (52) of a film component (38), and the second opening reaches a second surface (54) of the film component (38) on the opposite side of the first surface (52). In a state in which the air-permeable waterproof plug (32) is attached to the atmosphere introduction port (14), the inner peripheral surface (56) of the protruding portion (36) is in close contact with the outer peripheral surface (24) of a columnar portion (22) provided to the atmosphere introduction port (14), and an atmosphere introduction hole (28) opening at the tip (30) of the columnar portion (22) communicates with a first opening (44) of the main body portion (34).

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