The present invention relates to a system for three-dimensional shape measurement El UTP using the optical scanning device, in particular blood irradiating a laser beam on the measuring body, and from the measured body by using the position of the reflected laser beam is located on the line passing through the laser beam in the conventional system for measuring the shape of El UTP of the measured body, the electrical control so as to be parallel to the incident laser beam, further comprising a second scanner to the output shaft by changing the path by, first conveying portion as well as the scan axis and a second axis perpendicular to the first axis for scanning movement, and also to be performed at a time, a structure for correcting the error arising in the course of a scan is the invention which is characterized in that further added. ; According to the present invention, there is provided Y- scanner and the error correcting apparatus for three-dimensional shape measurement system, which is used in the El UTP two dimensional slope measuring device, whereby the transfer portion mechanically in a reciprocating without the movement has become possible to scan the entire surface of the measured object at a time.
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