The insertion portion of the endoscope (2) side, provided with a (41) comprising a connector (46) (45), electrical connections (44), a suction connection section connecting the air and water supply portion, to a fluid supply device side, by providing (31B) including a connector (36B) (35), electrical connections (34), a suction connection section connecting the air and water supply section, and so as to be detachable from each other. At this time, I will be projecting (43) partition of the surface of the connector (41), from between electrical connection (46), the air and water supply and connections (44) suction connections, and (45). On the other hand, the connector (31B), the partition and the electrical connections (36B), air and water supply and connections (34) suction connections, and (35), the partition receiving recess which receives the (43) (33B) It is provided between, thereby projecting cylindrical wall portion (32a) from the outer side. And, when connecting the connectors, the partition (43), so as to isolate drip-proof, waterproof and electrical connection side, and a fluid system connection side.内視鏡の挿入部(2)側に、送気送水接続部(44)、吸引接続部(45)、電気接続部(46)を含むコネクタ(41)を設けるとともに、流体供給装置側に、送気送水接続部(34)、吸引接続部(35)、電気接続部(36B)を含むコネクタ(31B)を設けて、互いに着脱可能となるようにする。このとき、コネクタ(41)の表面の、電気接続部(46)と、送気送水接続部(44)および吸引接続部(45)と、の間から仕切(43)を突設させる。一方、コネクタ(31B)には、この仕切(43)を受ける仕切受凹部(33B)を、電気接続部(36B)と、送気送水接続部(34)および吸引接続部(35)と、の間に設けるとともに、外周側から筒状壁部(32a)を突設させる。そして、コネクタ同士の接続時に、仕切(43)が、電気接続部側と、流体系接続部側と、を防滴、防水に隔離するようにする。
