A clip cartridge (80; 80A; 80B; 80C), comprising: a clip unit (10; 10A; 10B; 10C) configured to treat a target tissue in a body having: a pressing tube (31; 31A) extending along a longitudinal axis (C1); an arm member (11; 11A; 11B) inserted into the pressing tube (31; 31A); and a connection portion provided on the arm member (11; 11A; 11B) and configured to be capable to transition between a protrusion configuration protruding from the pressing tube (31; 31A) and an accommodation configuration of being accommodated in the pressing tube (31; 31A); and a housing (40; 50; 60; 70) configured to be able to accommodate the clip unit (10; 10A; 10B; 10C), wherein the housing (40; 50; 60; 70) having: a stopper (36; 56) configured to restrict the transition of the connection portion from the protrusion configuration to the accommodation configuration; and a release mechanism configured to release the restriction by the stopper (36; 56) with respect to the transition of the connection portion from the protrusion configuration to the accommodation configuration, and wherein the stopper (36; 56) is configured to restrict the transition of the clip unit (10; 10A; 10B; 10C) by coming in contact with the pressing tube (31; 31A). a clip unit (10; 10A; 10B; 10C) configured to treat a target tissue in a body having: a pressing tube (31; 31A) extending along a longitudinal axis (C1); an arm member (11; 11A; 11B) inserted into the pressing tube (31; 31A); and a connection portion provided on the arm member (11; 11A; 11B) and configured to be capable to transition between a protrusion configuration protruding from the pressing tube (31; 31A) and an accommodation configuration of being accommodated in the pressing tube (31; 31A); and a pressing tube (31; 31A) extending along a longitudinal axis (C1); an arm member (11; 11A; 11B) inserted into the pressing tube (31; 31A); and a connection portion provided on the arm member (11; 11A; 11B) and configured to be capable to transition between a protrusion configuration protruding from the pressing tube (31; 31A) and an accommodation configuration of being accommodated in the pressing tube (31; 31A); and a housing (40; 50; 60; 70) configured to be able to accommodate the clip unit (10; 10A; 10B; 10C), wherein the housing (40; 50; 60; 70) having: a stopper (36; 56) configured to restrict the transition of the connection portion from the protrusion configuration to the accommodation configuration; and a release mechanism configured to release the restriction by the stopper (36; 56) with respect to the transition of the connection portion from the protrusion configuration to the accommodation configuration, and a stopper (36; 56) configured to restrict the transition of the connection portion from the protrusion configuration to the accommodation configuration; and a release mechanism configured to release the restriction by the stopper (36; 56) with respect to the transition of the connection portion from the protrusion configuration to the accommodation configuration, and wherein the stopper (36; 56) is configured to restrict the transition of the clip unit (10; 10A; 10B; 10C) by coming in contact with the pressing tube (31; 31A). <EOS>