Waterproof electronic device and production method of waterproof electronic device

A production method for waterproof electronic device comprising a hermetically sealed housing constituted by a case and a cover having an opening, a circuit substrate hermetically sealed in the hermetically sealed housing, a resin-made connector housing having a wall for partitioning inside and outside mounted on the circuit substrate and partially exposed from the opening of the hermetically sealed housing, a plurality of connection terminal press-fitted into the wall for partitioning inside and outside of the connecter housing, and one end of the connection terminal connected to a circuit pattern of the circuit substrate and the other end being in conductive contact with a contact terminal of a mating connector, the method comprising the steps of:

• filling and applying a first annular sealing material between a first sealing surface provided on an outer peripheral part of the case and a second sealing surface provided on an outer peripheral part of the cover;
• filling and applying a second annular sealing material between a first fitting member provided at the opening of the sealed housing and a second fitting member provided at the outer periphery of the body of the connector housing;
• applying a terminal part sealing material to a connection surface which is an inner surface of the wall for partitioning inside and outside of the connector housing and is connected to the circuit substrate;
• and
• providing the hermetically sealed housing with a sealable ventilation passage that communicates the inside of the hermetically sealed housing with outside air,
• wherein in the step of providing the hermetically sealed housing with the sealable ventilation passage, the ventilation passage is sealed when the case and the cover are integrated with a fastening member or after the case and the cover are integrated.