PURPOSE: To obtain an apparatus for measuring at least the tow angle displacement, camber angle displacement, lateral displacement, longitudinal displacement and vertical displacement of a wheel part.

CONSTITUTION: A link mechanism is constituted such that the base part 1 on the car body side is linked with the base part 22 on the wheel side through two sets of parallel links 3, 8. It can oscillate in the breadthwise direction through a first rotary joint 6 and can be displaced rotationally in the tow direction and camber direction of the wheel through second and third rotary joints 21, 12. Displacement of rotational angle can be detected between respective links by means of respective potentiometers.