VENTILATION WATER IMPERMEABLE UNIT AND VENTILATION WATER IMPERMEABLE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a ventilation water impermeable unit and a ventilation water impermeable device using this unit, simple in a constitution, and excellent in moldability and assemblability of a rubber part and retentivity of a ventilation water impermeable sheet, which are constituted of two rubber parts and the ventilation water impermeable sheet, in the ventilation water impermeable unit for holding the ventilation water impermeable sheet by a unit separate from a housing.SOLUTION: The ventilation water impermeable sheet is sandwiched and held between a rubber outer case and an inner case. The ventilation water impermeable sheet is sandwiched between an inner case side surface of a perforated top plate part of the outer case and an outer case side end surface of the inner case, and a taper inner cylindrical surface for reducing a diameter toward an end part on the opposite side of the perforated top plate part of a cylindrical part, is formed on a cylindrical part inner peripheral surface of the outer case, and a taper outer cylindrical surface having a larger diameter than the taper inner cylindrical surface of the outer case in a free state and reducing in diameter by being fitted to the taper inner cylindrical surface, is formed on an outer peripheral surface of the inner case.