| 摘要 |
A connector includes a body portion having an inner peripheral surface defining a cylindrical insertion hole for inserting therein a connection member and an O-ring. A recess portion is provided in the inner peripheral surface of the body portion, and is opened in the body portion in a radial direction of the body portion, at a position on an inlet side of the insertion hole than the arrangement position of the O-ring. Furthermore, the recess portion extends in an axial direction of the body portion and has an end portion on a side of an arrangement position of the O-ring, and the end portion of the recess portion becomes in an acute angle shape which is acute toward the arrangement position of the O-ring. Alternatively, an angle reducing portion may be provided in the recess portion on a side of the arrangement position of the O-ring.
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