The connector extends in the longitudinal axis direction on the outer peripheral surface of the gripping portion, and extends in a direction intersecting the longitudinal axis direction on the peripheral surface on the opposite side of the upper surface finger hooking portion on which the first finger is placed, A lower surface finger hanging portion on which the second finger or the third finger is hooked when placed on the upper surface finger hanging portion, and a guide protrusion that is arranged on the same straight line in the longitudinal axis direction as the upper surface finger hanging portion and determines the insertion position The receiving side is directly inserted by inserting the fingertip of the first finger placed on the upper surface finger-hooking portion into the guide groove that is formed on the receiving-side connector and has a known arrangement position to be fitted with the guide protrusion. Mated to connector.コネクタは、把持部の外周面上で長手軸方向に延び、第１指を置く上面指掛け部と、上面指掛け部の反対側の周面で長手軸方向と交差する方向に延び、第１指を上面指掛け部に置いて把持した際に第２指又は第３指が指掛かりする下面指掛け部と、上面指掛け部と長手軸方向の同一直線上に配置され、差し込まれる位置を決めるガイド突起部とを備え、受け側コネクタに形成されてガイド突起部と嵌合する配置位置が既知なガイド溝に対して上面指掛け部に置かれた第１指の指先を向けて差し込むことで直接的に受け側コネクタに嵌合される。
