An endoscope connecting tube includes a liquid feeding index including: an exterior； an exposure hole provided on the exterior； and a flow path； and a movable member that is brought into a convex warp state toward a surface direction of the exterior when an inner pressure of a flow path reaches a predetermined value or higher, and remains in the convex warp state even when the inner pressure of the flow path reaches less than the predetermined value； and a marker that projects from the exposure hole by the movable member being brought into the convex warp state； a releasing portion that releases the convex warp state of the movable member by causing the marker to slide and push the movable member； and an insertion path into which the releasing portion is inserted.
