The connector has the female side lumen section which is communicated with the tubular male connector and the male side lumen section which possess the male side lumen section, in order the other male connector which is similar to the male connector in the female side lumen section the 1st structure which possesses the tubular female connector which is connection possible and, in the 1st structure the installation possible applied part and, for the male connector and connected direction to become mutually parallel installation when it is installed in the 1st structure, adjoining, connects with the female connector the male lock section and installation when it is arrangedIn order for direction to become mutually parallel, adjoining, it is arranged, the other male lock section which is similar to the male lock section has with the 2nd structure which the female lock section which is connection possible possesses, in order to be able to select, whether the 1st structure is used, or is used the occasion where you use that, installing the 2nd structure, without installing the 2nd structure, it is constituted.コネクタは、オス側内腔部を有する管状のオスコネクタ部と、オス側内腔部と連通するメス側内腔部を有し、メス側内腔部にオスコネクタ部と同様の他のオスコネクタ部が接続可能な管状のメスコネクタ部とを有する第1の構造体と、第1の構造体に装着可能な装着部と、第1の構造体に装着された装着状態でオスコネクタ部と接続方向が互いに平行となるように隣接して配置されるオスロック部と、装着状態でメスコネクタ部と接続方向が互いに平行となるように隣接して配置され、オスロック部と同様の他のオスロック部が連結可能なメスロック部とを有する第2の構造体とを備え、第1の構造体は、それを使用する際、第2の構造体を装着して使用されるかまたは第2の構造体を装着せずに使用されるかを選択し得るよう構成されている。
