PURPOSE: To make it possible to convey works even in an oblique direction and to perform the datum level fitting for said works or other similar operation by installing a convey roller which can be freely rotated to the conveying direction for said works and further can be freely rotated at a fixed angle around a vertical shaft.

CONSTITUTION: Along the longitudinal direction of a work supporting plate 1, convey rollers 3 are installed so that said convey rollers 3 can be rotated at an angle between the conveying direction of a work 5 and about 45° inclined direction to change the conveying direction, and free bearings 7 are installed to make the conveying of said work 5 smooth. When said work 5 is conveyed by fitting one side of said work 5 on the datum level, guide rollers 25 are arranged along one side of said work supporting plate 1, said conveying rollers 3 are rotated to make an oblique angle, said work 5 is conveyed in an oblique direction (a), and the datum level fitting is performed by putting one side of said work 5 to said guide rollers 25. Then, said conveying rollers 3 are rotated back to the direction along the conveying direction (b) for said work 5, and said work 5 is conveyed to its conveying direction (b).