Calibration jig

A calibration jig that calibrates a measurement apparatus for measuring a three-dimensional geometry of a measurement target, the calibration jig comprising:

• a plurality of elements to be measured;
• a frame part to which the plurality of elements to be measured are attached;
• and
• a mechanism part that moves the frame part, wherein the mechanism part includes:
• a rotation mechanism that rotates the frame part about a first axis;
• a first swinging mechanism that swings the frame part about a second axis orthogonal to the first axis;
• and
• a second swinging mechanism that swings the frame part about a third axis orthogonal to the first axis and the second axis,
• the mechanism part includes a support member that supports the frame part,
• the first swing mechanism includes:
• a first movable part coupled to the support member;
• and
• a first linear actuator that moves the first movable part, and
• the first swing mechanism is configured such that the support member swings about the second axis by causing the first linear actuator to move the first movable part,
• the second swing mechanism includes:
• a second movable part coupled to the support member;
• and
• a second linear actuator that moves the second movable part,
• the second swing mechanism is configured such that the support member swings about the third axis by causing the second linear actuator to move the second movable part, and
• a connecting part between the first movable part and the support member and a connecting part between the second movable part and the support member are ball joints, central parts of the plurality of ball joints are located in a plane orthogonal to the first axis, and a swivel center of the support member is located in the plane.