This invention comprises a sensor (40) having a slit-ray generator (41) and a camera (42), a calibration block (100) for calibrating 3-dimensional coordinate values, a computer (10) for processing 2-dimensional coordinate values of the calibration block (100) and the object (90) to obtain data of 3-dimensional space coordinate and output it to CRT (60), a robot hand (10) for moving the sensor (40) on multiple axes. Therefore, this invention can measure the section profile shape of a tire, etc. accurately and quickly.
