A body position fixing apparatus that fixes a human body placed in a lateral position on a placement surface, the apparatus comprising: a first pressing tool including a first pressing surface to be pressed against one of a pair of anterior superior iliac spines of the human body, that is closer to the placement surface; a second pressing tool including a second pressing surface to be pressed against another one of the pair of anterior superior iliac spines, that is more distant from the placement surface; a third pressing tool including a third pressing surface to be pressed against a pubic symphysis of the human body; a fourth pressing tool including a fourth pressing surface that faces the first pressing surface, the second pressing surface, and the third pressing surface, and that is to be pressed against a back of a lumbar region of the human body; a stand to which the first pressing tool, the second pressing tool, and the third pressing tool are attached; and an angle indicator including: an indicating rod; a rotation mechanism that supports the indicating rod to make the indicating rod rotatable at a discretionary angle relative to each of the placement surface and a fixed reference plane including the first pressing surface, the second pressing surface, and the third pressing surface; and a first base attached to the stand, the rotation mechanism including a first angle adjuster including a first guide member to which the indicating rod is attached to be rotatable about a first axis that is parallel to a direction intersecting a reference line passing the first pressing surface and the second pressing surface; characterized in that the rotation mechanism further includes: a second angle adjuster including a second guide member which is fixed to the first base and to which the first guide member is attached so that the first angle adjuster is rotatable about a second axis that is parallel to the reference line; and a first stopper mechanism that restricts the rotation of the indicating rod by the first angle adjuster. a first pressing tool including a first pressing surface to be pressed against one of a pair of anterior superior iliac spines of the human body, that is closer to the placement surface; a second pressing tool including a second pressing surface to be pressed against another one of the pair of anterior superior iliac spines, that is more distant from the placement surface; a third pressing tool including a third pressing surface to be pressed against a pubic symphysis of the human body; a fourth pressing tool including a fourth pressing surface that faces the first pressing surface, the second pressing surface, and the third pressing surface, and that is to be pressed against a back of a lumbar region of the human body; a stand to which the first pressing tool, the second pressing tool, and the third pressing tool are attached; and an angle indicator including: an indicating rod; a rotation mechanism that supports the indicating rod to make the indicating rod rotatable at a discretionary angle relative to each of the placement surface and a fixed reference plane including the first pressing surface, the second pressing surface, and the third pressing surface; and a first base attached to the stand, the rotation mechanism including a first angle adjuster including a first guide member to which the indicating rod is attached to be rotatable about a first axis that is parallel to a direction intersecting a reference line passing the first pressing surface and the second pressing surface; an indicating rod; a rotation mechanism that supports the indicating rod to make the indicating rod rotatable at a discretionary angle relative to each of the placement surface and a fixed reference plane including the first pressing surface, the second pressing surface, and the third pressing surface; and a first base attached to the stand, the rotation mechanism including a first angle adjuster including a first guide member to which the indicating rod is attached to be rotatable about a first axis that is parallel to a direction intersecting a reference line passing the first pressing surface and the second pressing surface; characterized in that the rotation mechanism further includes: a second angle adjuster including a second guide member which is fixed to the first base and to which the first guide member is attached so that the first angle adjuster is rotatable about a second axis that is parallel to the reference line; and a first stopper mechanism that restricts the rotation of the indicating rod by the first angle adjuster. a second angle adjuster including a second guide member which is fixed to the first base and to which the first guide member is attached so that the first angle adjuster is rotatable about a second axis that is parallel to the reference line; and a first stopper mechanism that restricts the rotation of the indicating rod by the first angle adjuster.