PROBLEM TO BE SOLVED: To provide a connecting member which prevents loosening of a lock ring by generating resistance force against rotation of the lock ring in the loosening direction.SOLUTION: The connecting member comprises a male connector 2 and the lock ring 3. The male connector has annular step surfaces formed on a diameter enlarging section 8 at a proximal part of a cylindrical tube insertion section 7 and male connector side engaging projections 10 formed on the step surfaces. The lock ring 3 is a cylindrical body having an end opening into which the male connector is inserted, and has an abutting section 18 that abuts the step surfaces of the male connector and a female screw section 19 formed on the inner circumference and threadable to the male screw section. Lock ring side engaging projections 20 are formed on the abutting section of the lock ring. When the lock ring is rotated in the locking direction while the female screw section of the lock ring is threaded into the male screw section, which is an object to be connected, top parts of the lock ring side engaging projections slide over top parts of the male connector side engaging projections and are screwed into a predetermined position at which the rotation of the lock ring stops to turn locked.COPYRIGHT: (C)2009,JPO&INPIT【課題】ロックリングの緩み方向の回転に抵抗力を発生させて緩みを防止することができる接続部材を提供する。【解決手段】筒体のチューブ挿入部７の基端部分の拡径部８に段差面を環状に形成し、段差面にオスコネクタ側係合突起１０を形成したオスコネクタ２と、一方の端部開口部からオスコネクタを挿入可能な筒体であって、オスコネクタの段差面が当接可能な当接部１８を形成し、内周面には、接続対象の雄ねじ部に螺合可能な雌ねじ部１９を形成したロックリング３とを備え、ロックリングの当接部にロックリング側係合突起２０が形成され、ロックリングの雌ねじ部を接続対象の雄ねじ部に螺合した状態でロックリングがロック方向に回転されると、ロックリング側係合突起の頂部がオスコネクタ側係合突起の頂部上を摺動しつつ乗り越えて、ロックリングの回転が止まる所定位置まで絞め込まれることでロック状態となるようにした。【選択図】図１
