PROBLEM TO BE SOLVED: To provide a lock type connecting tool capable of reliably preventing loosening of screwing by lock means.SOLUTION: The lock type connecting tool includes: a male connector 10 including a connecting insertion part 11 formed at a tip part； a female connector 14 which includes a fitting part 14c that is fittable thereto by causing the connecting insertion part 11 to insert therein, is connected to the male connector 10 by fitting of the connecting insertion part 11 to the fitting part 14c to cause liquid to distribute, and has a male screw part 14b formed on the outer peripheral surface； and lock means 12 which is attached to the male connector 10, and includes a female screw part 12a that is screwable with the male screw part 14b, formed on the inner peripheral surface. The lock type connecting tool further includes a helical spring 13 for energizing always the lock means 12 in an opposite direction of a direction to that the screwing is loosened under a state that the female screw part 12a of the lock means 12 is screwed with the male screw part 14b.SELECTED DRAWING: Figure 6【課題】ロック手段による螺合の緩みを確実に防止することができるロック式接続具を提供する。【解決手段】先端部に接続挿入部１１が形成されたオスコネクタ１０と、接続挿入部１１を挿入させて嵌合可能な嵌合部１４ｃを有し、当該嵌合部１４ｃに対する接続挿入部１１の嵌合によりオスコネクタ１０と接続されて液体を流通可能とされるとともに、外周面に雄ネジ部１４ｂが形成されたメスコネクタ１４と、オスコネクタ１０に取り付けられるとともに、内周面に雄ネジ部１４ｂと螺合可能な雌ネジ部１２ａが形成されたロック手段１２とを具備したロック式接続具において、ロック手段１２の雌ネジ部１２ａが雄ネジ部１４ｂに螺合した状態で当該螺合が緩む方向と反対方向にロック手段１２を常時付勢するためのコイルばね１３を具備したものである。【選択図】図６
