A clip device comprising: a restraining tube having an insertion passage; first and second arm parts (20, 30) inserted into the insertion passage to protrude from a distal end of the restraining tube; an operation wire connected to the first arm part and configured to advance and retreat the first arm part with respect to the restraining tube; and a movement adjusting mechanism configured to adjust movement of the second arm part when the operation wire is operated for retreat by a predetermined distance and the first arm part is retreated, wherein the movement adjusting mechanism is configured to set a first range in which the first arm part moves independently of the second arm part with an advancing and retreating motion of the operation wire, and a second range in which the second arm part moves along with a retreating motion of the first arm part in an operation range of the first arm part that moves depending on a position of the operation wire with respect to the restraining tube, and wherein: in the first range, a position of a distal end of the first arm part in a direction of a longitudinal axis of the restraining tube is located distal to a distal end of the second arm part; and in the second range, the distal end of the first arm part approaches the distal end of the second arm part, and the distal end of the first arm part and the distal end of the second arm part are configured to be engaged and closed, characterized in that the movement adjusting mechanism includes: a convex part provided for the first arm part; and a slit which is formed in the second arm part and in which the convex part is slidable; wherein the convex part is configured to slide in the slit in the first range; and the convex part is configured to come into contact with an end of the slit, and the second arm part is configured to be retreated along with retreat of the first arm part in the second range. a restraining tube having an insertion passage; first and second arm parts (20, 30) inserted into the insertion passage to protrude from a distal end of the restraining tube; an operation wire connected to the first arm part and configured to advance and retreat the first arm part with respect to the restraining tube; and a movement adjusting mechanism configured to adjust movement of the second arm part when the operation wire is operated for retreat by a predetermined distance and the first arm part is retreated, wherein the movement adjusting mechanism is configured to set a first range in which the first arm part moves independently of the second arm part with an advancing and retreating motion of the operation wire, and a second range in which the second arm part moves along with a retreating motion of the first arm part in an operation range of the first arm part that moves depending on a position of the operation wire with respect to the restraining tube, and wherein: in the first range, a position of a distal end of the first arm part in a direction of a longitudinal axis of the restraining tube is located distal to a distal end of the second arm part; and in the second range, the distal end of the first arm part approaches the distal end of the second arm part, and the distal end of the first arm part and the distal end of the second arm part are configured to be engaged and closed, characterized in that the movement adjusting mechanism includes: a convex part provided for the first arm part; and a slit which is formed in the second arm part and in which the convex part is slidable; wherein the convex part is configured to slide in the slit in the first range; and the convex part is configured to come into contact with an end of the slit, and the second arm part is configured to be retreated along with retreat of the first arm part in the second range. in the first range, a position of a distal end of the first arm part in a direction of a longitudinal axis of the restraining tube is located distal to a distal end of the second arm part; and in the second range, the distal end of the first arm part approaches the distal end of the second arm part, and the distal end of the first arm part and the distal end of the second arm part are configured to be engaged and closed, characterized in that the movement adjusting mechanism includes: a convex part provided for the first arm part; and a slit which is formed in the second arm part and in which the convex part is slidable; wherein the convex part is configured to slide in the slit in the first range; and the convex part is configured to come into contact with an end of the slit, and the second arm part is configured to be retreated along with retreat of the first arm part in the second range. a convex part provided for the first arm part; and a slit which is formed in the second arm part and in which the convex part is slidable; wherein the convex part is configured to slide in the slit in the first range; and the convex part is configured to come into contact with an end of the slit, and the second arm part is configured to be retreated along with retreat of the first arm part in the second range.