Problem to be solved: to provide a holding device for osteotomy in which the whole of the cutting is visible.The fixture (220) isA first separation member (221B) having a first inner surface (221p) and a first outer surface (221q) formed in a wedge shape gradually thickened to the first inner surface from the distal end to the rear end side and having a first outer surface (221q) contacting the boneThe second inner surface (221p) is provided with a second separation member (221A) which is formed into a wedge shape gradually thickened from the distal end to the second inner surface with a second outer surface (221q) contacting the bone.The holding device is a second base having a guide member (222b) provided on the rear end side of the first separating member and for guiding the opening and closing operation of the first and second separating members, and a second base having an opening (222c) provided at the rear end side of the second separation member to which the guide member is inserted A portion (225A) is provided, and a holding part (223) for holding the sliding of the guide member and the opening is provided.Diagram
