Patent ID: 8568072

Claim:
A screw hole seal structure for sealing a screw hole during molding a fiber-reinforced resin member in which an insert member provided with the screw hole is integrally incorporated, comprising: a screw member tightened in the screw hole; and an elastic seal member disposed within the screw hole, wherein the screw hole has a counterbore that is formed at a screw member insertion side of the screw hole through which the screw member is inserted into the screw hole, an internal thread portion which is formed to a side of the counterbore that is opposite to the screw member insertion side and which is smaller in diameter than the counterbore, and a counterbore seat that is formed between the counterbore and the internal thread portion, and wherein the screw member has an external thread portion that extends in an axial direction of the screw member and that is tightened into the internal thread portion, a head of that is larger in diameter than the external thread portion and that is disposed within the counterbore by tightening the external thread portion into the internal thread portion, and a shaft step portion formed between the external thread portion and the head, and wherein the elastic seal member is compressed between the counterbore seat and the shaft step portion, and is pressed against an inner peripheral surface of the counterbore.