PROBLEM TO BE SOLVED: To provide a collar with a connective tool for an animal that has a ring body with sufficient strength, and is coupled to a tether or a mooring rope side with high degree of freedom thereby hardly quirking.SOLUTION: The collar DCC with the connective tool which is put on the animal includes: a belt body Bb having a predetermined thickness Tb and a predetermined width Wb and stretching； a first rectangular ring Rs1 fixed to the belt body Bb； a buckle (Bu) attached to one edge of the belt body Bb； the ring body Rd fixed rotatably to the belt body Bb adjoining the first rectangular ring Rs1 between the first rectangular ring Rs1 and the buckle Bu； the connective tool CC coupled to the ring body Rd.【課題】強度が十分な環本体を有して引き紐や係留紐側と自由度高く連結され拗れにくい動物用の連結具付首輪を提供する。【解決手段】動物に装着される連結具付首輪ＤＣＣは、所定の厚みＴｂと所定の幅Ｗｂを有して延在するベルト本体Ｂｂと、ベルト本体Ｂｂに固定された第１の矩形環Ｒｓ１と、ベルト本体Ｂｂの一端に取り付けられた尾錠Ｂｕと、第１の矩形環Ｒｓ１と尾錠（Ｂｕ）との間に、第１の矩形環Ｒｓ１に隣接して、ベルト本体Ｂｂに回動自在に固定された環本体Ｒｄと、環本体Ｒｄに連結された連結具ＣＣとを備える。【選択図】図１
