Abstract: Clip delivery device has a sheath, a wire inserted into the sheath, and a clip detachably connected to the wire and having arms movable between an open position and a closed position. A tube is adjacent the sheath along a longitudinal axis and contains at least part of the clip and has a convex portion on an inner surface. A connector provided in the sheath has a hook detachably connected with the convex portion. The hook is movable between a first position, in which the hook engages the convex portion and is at a first radial distance from a central axis of the sheath, and a second position, in which the hook is disengaged from the convex portion and is at a second radial distance from the central axis of the sheath, where the first radial distance is greater than the second radial distance, by moving the wire.