In the present invention the problem is, the component force measuring spindle unit having a two multi-component force measuring sensors at spaced locations along the spindle axial direction, to ensure a transformation matrix to be used when available the actual load acting on the tire correction It can and will be calculated by using the correction conversion matrix, a translational force and moment generated in the tire with high precision. Calibration method for multi-component force measuring spindle unit (1) according to the present invention is applied to "measurement process", and measuring force vector and the measurement force vector obtained in the measurement step for measuring the load acting on the spindle shaft 4, using the transformation matrix E of the tire (T) prior to the "output process", and the calculation process to obtain the actual load vector acting on, and measuring the measurement force vector based on the plurality of the first independent test conditions, and calibrating the transformation matrix E on the basis of the resultant measurement force vector has a "correction process." ; 展开▼
