A clip treatment tool comprising: a clip body that has two clip pieces (24A, 24B), each of the two clip pieces (24A, 24B) having a body portion and an arm portion, the arm portions facing each other and respectively extending from the body portions toward a distal end side, each of the body portions having a fixing hole formed on a proximal end side and a movement hole formed on the distal end side relative to the fixing hole, the movement hole extending so as to be inclined from a side part in a width direction of the body portion on the proximal end side toward a middle in the width direction of the body portion on the distal end side; a container tube that contains the body portions therein; a stopper that extends through the fixing holes and is attached to the clip body; and a fixing pin that extends through the movement holes and whose both end portions are fixed to positions in the container tube that face each other, wherein the movement hole of each of the two clip pieces (24A, 24B) has a proximal-end-side region and a distal-end-side region, the proximal-end-side region extending so as to be inclined from the side part in the width direction of the body portion on the proximal end side toward the middle in the width direction of the body portion on the distal end side, the distal-end-side region being located at the middle in the width direction of the body portion on the distal end side and extending from the proximal-end-side region toward the distal end side, wherein, in accordance with a movement of the clip body from the proximal end side toward the distal end side, the arm portions are configured to enter an open state and the body portions are configured to move in such a way that a position of the fixing pin moves along the proximal-end-side regions of the movement holes relatively from the distal end side toward the proximal end side, and wherein, in accordance with a movement of the clip body from the distal end side toward the proximal end side, the arm portions are configured to enter a closed state, and the body portions are configured to move in such a way that the position of the fixing pin moves from the proximal-end-side regions to the distal-end-side regions of the movement holes along the proximal-end-side regions relatively from the proximal end side toward the distal end side, characterized in that an opening (50A, 50B) is formed in the container tube, wherein, in accordance with the movement of the clip body from the distal end side toward the proximal end side, the stopper is configured to move to a position of the opening (50A, 50B) and fit into the opening (50A, 50B) such that the clip body is locked to the container tube. a clip body that has two clip pieces (24A, 24B), each of the two clip pieces (24A, 24B) having a body portion and an arm portion, the arm portions facing each other and respectively extending from the body portions toward a distal end side, each of the body portions having a fixing hole formed on a proximal end side and a movement hole formed on the distal end side relative to the fixing hole, the movement hole extending so as to be inclined from a side part in a width direction of the body portion on the proximal end side toward a middle in the width direction of the body portion on the distal end side; a container tube that contains the body portions therein; a stopper that extends through the fixing holes and is attached to the clip body; and a fixing pin that extends through the movement holes and whose both end portions are fixed to positions in the container tube that face each other, wherein the movement hole of each of the two clip pieces (24A, 24B) has a proximal-end-side region and a distal-end-side region, the proximal-end-side region extending so as to be inclined from the side part in the width direction of the body portion on the proximal end side toward the middle in the width direction of the body portion on the distal end side, the distal-end-side region being located at the middle in the width direction of the body portion on the distal end side and extending from the proximal-end-side region toward the distal end side, wherein, in accordance with a movement of the clip body from the proximal end side toward the distal end side, the arm portions are configured to enter an open state and the body portions are configured to move in such a way that a position of the fixing pin moves along the proximal-end-side regions of the movement holes relatively from the distal end side toward the proximal end side, and wherein, in accordance with a movement of the clip body from the distal end side toward the proximal end side, the arm portions are configured to enter a closed state, and the body portions are configured to move in such a way that the position of the fixing pin moves from the proximal-end-side regions to the distal-end-side regions of the movement holes along the proximal-end-side regions relatively from the proximal end side toward the distal end side, characterized in that an opening (50A, 50B) is formed in the container tube, wherein, in accordance with the movement of the clip body from the distal end side toward the proximal end side, the stopper is configured to move to a position of the opening (50A, 50B) and fit into the opening (50A, 50B) such that the clip body is locked to the container tube.