PROBLEM TO BE SOLVED: To enhance operation accuracy of THA or the like.SOLUTION: A posture fixing device includes: a first press/contact tool including a first press/contact face pressed against and contacting an anterior superior iliac spine near a placement face out of a pair of anterior superior iliac spines of a human body； a second press/contact tool including a second press/contact face pressed against and contacting an anterior superior iliac spine far from the placement face out of the pair of anterior superior iliac spines； a third press/contact tool including a third press/contact face pressed against and contacting a pubic symphysis of the human body； a fourth press/contact tool including a fourth press/contact face facing the first, second, and third press/contact faces and pressed against and contacting a waist back face of the human body； an instruction rod； and a rotation mechanism supporting the instruction rod so as to be rotated at any angle with respect to each of a fixed reference face containing the first, second, and third press/contact faces and the placement face.SELECTED DRAWING: Figure 1【課題】ＴＨＡなどの施術の精度を高める。【解決手段】体位固定装置は、人体の一対の上前腸骨棘のうち載置面に近い上前腸骨棘に押し当てられる第１押当面を有した第１押当具と、上記一対の上前腸骨棘のうち上記載置面から遠い上前腸骨棘に押し当てられる第２押当面を有した第２押当具と、上記人体の恥骨結合に押し当てられる第３押当面を有した第３押当具と、上記第１押当面、上記第２押当面、及び上記第３押当面と対向するとともに上記人体の腰部背面に押し当てられる第４押当面を有した第４押当具と、指示ロッドと、上記第１押当面、上記第２押当面、及び上記第３押当面を含む固定基準面及び上記載置面の各々に対して任意の角度に回動可能となるように上記指示ロッドを支持する回動機構と、を備えている。【選択図】 図１
