By restricting the consolidated range of movement of the object, by consolidated to notch of the operating unit to provide a connecting device for an animal that it is possible to prevent the push-back force is exerted. Coupler 200, stood up and a hook portion 4 and the shaft portion 50 from the base 3, they tip 4a, body 7 tip was without an opening 6 of the hook portion 4 to face, the hook portion 4 to the shaft portion 50 is the housing so as to advance and retreat to and from the tip to be able to open and close the opening portion 6 exposed, and the operation section 90, outwardly in the notches 91 of the operation portion 90 through the sliding groove 8a of the shaft portion 50 and the locking pin 110, the locking pin 110 a spring 12 for biasing to abut the tip of the hook portion 4, the body 7, the hook portion between the rising from the base 3 of the shaft portion 50 and the hook portion 4 so as to extend in the consolidated region 14 side of the consolidated 13 of 4, out of the consolidated is to regulate the play of the consolidated region 14 and the base side from the tip of the scope of consolidation of the hook portion, it led to the opening 6 and it has a regulation wall portion 10 formed with the constraining window 15 to be.連結対象の移動範囲を規制して、操作部の刻み目に連結対象による押し戻し力が及ぶのを防止できる動物用の連結具を提供する。連結具200は、基部3からフック部4と軸部50とが立ち上がって、それら先端部4a、先端が対向してフック部4の開放部6をなした本体7、軸部50にフック部4の先端部との間で進退するように収容されて前記開放部6を開閉でき、かつ、その操作部90が、軸部50のスライド溝8aを通じ操作部90の刻み目部91で外方に露出された係止ピン110、係止ピン110をフック部4の先端部に当接するよう付勢するばね12を備え、本体7は、基部3から軸部50及びフック部4の立ち上がり間においてフック部4の連結対象13との連結域14側に延びて、フック部の連結対象との先端部からの連結域14と基部側への遊びとを規制し、開放部6に繋がって連結対象を出入りさせる規制窓15を形成した規制壁部10を有する。
