Resin case in which gas-permeability and waterproof quality are compatible, and die for manufacturing such case

摘要

A through hole ( 50 ) with an annular groove ( 52 ) provided about its periphery is formed in a resin case ( 10 ). The through hole ( 50 ) is covered with a water/oil-repellent film ( 40 ) comprising a porous film ( 44 ). The through hole ( 50 ) makes the resin case ( 10 ) gas-permeable, and the water/oil-repellent film ( 40 ) prevents entry of external water and oil, etc.