Waterproof electronic equipment and assembly method thereof

Waterproof electronic equipment comprising:

• a connector member having external connection terminals connected to a circuit board, a base provided to cover a rear surface of the circuit board and a lower part of an outer peripheral seal part of the connector member with the external connection terminals exposed to the outside and forms a first part of a casing, and a cover provided to cover a front surface of the circuit board and the rest of the outer peripheral seal part of the connector member and forms a second part of the casing, and a first seal part in which outer peripheral parts of the base and the cover are directly opposed and water-tightly sealed and a second seal part in which the outer peripheral parts are water-tightly sealed via the outer peripheral part of the connector member, having two intersection parts with the first seal part, the water-tight seals having concavo-convex surfaces including concavo threads and convex threads respectively formed on the opposed surfaces in close contact to mesh with each other via seal materials,
• wherein the circuit board is sandwiched by an innermost peripheral part convex thread at the base side and an innermost peripheral part concave thread at the cover side in the first seal part, and
• a convex thread forming the second seal part provided on the base are biased to be continuous to a concave thread forming the first seal part provided on the base in the intersection parts, and a seal surface step by which heights of a bottom surface of the concave thread and a top surface of the convex thread from an inner bottom surface of the base are nearly equal to each other.