Ligation apparatus

The present invention relates to a ligation apparatus that ligatures living tissue by a clip and provides an optimal ligation apparatus for ligaturing living tissue in a body cavity. The ligation apparatus includes a clip (26) in which a clip claw member (42) is advanced and retreated relative to a pressing member (40) to be opened and closed, a sheath (28) which is configured to accommodate the clip (26) such that the clip claw member (42) is not exposed to the outside, an advance and retreat restricting mechanism (50, 52, 54, 56) which restricts advance and retreat of the pressing member (40) relative to the sheath (28) at a distal end portion of the sheath (28) and allows advance and retreat of the clip claw member (42) relative to the pressing member (40) according to advance and retreat of the operation wire (30) relative to the sheath (28) so as to allow the clip (26); ligaturing living tissue, and a releasing mechanism (66, 74, 76, 78) which releases at least a portion of the clip (26) in a state that the clip (26) ligatures the living tissue.