Resin member with gas permeable member and method of manufacturing the same, casing, and sensor

A method of manufacturing a resin member with a gas permeable member by injecting molten resin, for molding, into a cavity formed between a first mold and a second mold, the resin member with a gas permeable member comprising a resin member having at least one gas hole extending therethrough between a front surface and a back surface thereof, and a sheet-like gas permeable member being larger in outline than the gas hole and covering the gas hole in a gas permeable manner, an outer circumferential portion of the gas permeable member being embedded in the resin member,

• the first mold and the second mold having respectively at least one center protrusion which comes into contact with a central portion of the gas permeable member excluding the outer circumferential portion and is adapted to form the gas hole,
• at least one of the first mold and the second mold having at least one first protrusion disposed radially outward of the center protrusion and in contact with a portion of the outer circumferential portion of the gas permeable member, and
• at least one of the first mold and the second mold having at least one second protrusion disposed radially outward of the center protrusion and surrounding an outer peripheral edge of the gas permeable member,
• the method comprising:
• a gas permeable member disposing step of disposing the gas permeable member radially inward of the second protrusion formed in at least one of the first mold and the second mold;
• a cavity forming step of forming the cavity by disposing the first mold and the second mold with the central portion of the gas permeable member sandwiched between the center protrusions of the first mold and the second mold;
• and
• a resin molding step of injecting the molten resin into the cavity for molding.