A clip unit case (30; 230) for housing a clip unit comprising a clip having a plurality of arms which are closable to grip living tissue, a clamping member into which the clip is inserted to close the arms of the clip, and a coupling member which is to be inserted into the clamping member and engages with the clip, the coupling member being to be connected to one end of an elongated operating member (5, 8) for moving the coupling member, the clip unit case comprising an upper case (31, 32; 231, 232) and a lower case (32, 31; 232, 233), each of the upper and lower cases (31, 32; 231, 232) comprising: a clip unit housing portion (33; 233) provided at one end portion of the respective upper or lower case (31, 32; 231, 232); a first housing portion (37; 237) in which the clip is housed, the first housing portion (37; 237) being provided on an inner surface of the clip unit housing portion (33; 233); a second housing portion (38; 238) in which the clamping member is housed, the second housing portion (38; 238) being connected to the first housing portion (37; 237) and communicating with the first housing portion (37; 237); and a compressing portion (34; 234; 253) into which said one end of the operating member is to be inserted; wherein the compressing portions (34; 234; 253) are adapted to compress said one end of the operating member when inserted in the second housing portions (38; 238) to fix said one end of the operating member in the second housing portions (38; 238), characterized in that the compressing portions (34; 234; 253) comprise coupling portions (33a; 234a; 253a) which are provided between the clip unit housing portions (33; 233) and the remaining of the compressing portions (34; 234; 253), wherein the coupling portions (33a; 234a; 253a) are bent so that the compressing portions (34; 234; 253) are spaced apart from each other to form a spacing (34b; 234c; 253c) between the compressing portions (34; 234; 253), wherein - the compressing portions (34; 234; 253) are adapted to elastically deform at the coupling portions (33a; 234a; 253a), the coupling portions serving as fulcrums, so that said one end of the operating member is clamped by the compressing portions (34; 234; 253) when the compressing portions (34; 234; 253) are gripped with fingers by a user and the spacing (34b; 234c; 253c) is reduced, and - the compressing portions (34; 234; 253) are adapted to spread apart due to an elastic restoring force so that the operating member is removed from the spacing (34b; 234c; 253c) between the compressing portions (34; 234; 253) when said gripping force that is applied to the compressing portions (34; 234; 253) is weakened. a clip unit housing portion (33; 233) provided at one end portion of the respective upper or lower case (31, 32; 231, 232); a first housing portion (37; 237) in which the clip is housed, the first housing portion (37; 237) being provided on an inner surface of the clip unit housing portion (33; 233); a second housing portion (38; 238) in which the clamping member is housed, the second housing portion (38; 238) being connected to the first housing portion (37; 237) and communicating with the first housing portion (37; 237); and a compressing portion (34; 234; 253) into which said one end of the operating member is to be inserted; wherein the compressing portions (34; 234; 253) are adapted to compress said one end of the operating member when inserted in the second housing portions (38; 238) to fix said one end of the operating member in the second housing portions (38; 238), characterized in that the compressing portions (34; 234; 253) comprise coupling portions (33a; 234a; 253a) which are provided between the clip unit housing portions (33; 233) and the remaining of the compressing portions (34; 234; 253), wherein the coupling portions (33a; 234a; 253a) are bent so that the compressing portions (34; 234; 253) are spaced apart from each other to form a spacing (34b; 234c; 253c) between the compressing portions (34; 234; 253), wherein - the compressing portions (34; 234; 253) are adapted to elastically deform at the coupling portions (33a; 234a; 253a), the coupling portions serving as fulcrums, so that said one end of the operating member is clamped by the compressing portions (34; 234; 253) when the compressing portions (34; 234; 253) are gripped with fingers by a user and the spacing (34b; 234c; 253c) is reduced, and - the compressing portions (34; 234; 253) are adapted to spread apart due to an elastic restoring force so that the operating member is removed from the spacing (34b; 234c; 253c) between the compressing portions (34; 234; 253) when said gripping force that is applied to the compressing portions (34; 234; 253) is weakened. - the compressing portions (34; 234; 253) are adapted to elastically deform at the coupling portions (33a; 234a; 253a), the coupling portions serving as fulcrums, so that said one end of the operating member is clamped by the compressing portions (34; 234; 253) when the compressing portions (34; 234; 253) are gripped with fingers by a user and the spacing (34b; 234c; 253c) is reduced, and - the compressing portions (34; 234; 253) are adapted to spread apart due to an elastic restoring force so that the operating member is removed from the spacing (34b; 234c; 253c) between the compressing portions (34; 234; 253) when said gripping force that is applied to the compressing portions (34; 234; 253) is weakened.