A fluid supply device connection section 5, each end of which communicates with a fluid supply device connecting section 5, and the second flow portion 4 and the first flow portion 3 fluid supplied from the fluid supply device 100 passes, the first flow first flow is inserted provided in the other ends of the four second flow portion and the part 3, is connected to the opening 17k which communicates with the conduit 18 of the endoscope 10 is provided, the opening 17k in second discharge for discharging the opening 17k and around the first discharge portion 3t for discharging the conduit 18, the fluid that has passed through the section 3, the fluid which has passed through the second flow section 4 is disposed in the opening 17k around I comprises a, an endoscope connection 6 with parts and 4t.流体供給装置接続部5と、流体供給装置接続部5に各一端が連通された、流体供給装置100から供給された流体が通過する第1流通部3及び第2流通部4と、第1流通部3及び第2流通部4の各他端に設けられ、内視鏡10が具備する管路18に連通する開口部17kに対して接続される、開口部17k内に挿入されて第1流通部3を通過した流体を、管路18内に吐出する第1吐出部3tと、開口部17k周りに配置されて第2流通部4を通過した流体を開口部17k周りに吐出する第2吐出部4tとを有する内視鏡接続部6と、を具備する。
