PURPOSE: To fix embedded items without using a large amt. of labor by drawing kind, position and direction of the embedded item embedded in a concrete sheet on a light transmitting sheet as an accurate size-reduced figure, projecting it with expansion on a base stage, fixing the embedded item in accordance with this and feeding concrete there.

CONSTITUTION: Kind, position, direction etc., of an embedded item is drawn on a light transmitting sheet 1 by means of a computer wherein they have been inputted and they are projected on a base stage 7 for manufacturing a concrete sheet by means of a projector 2. The embedded item 8 is fixed on the manufacturing base stage 7 in accordance with this figure. If a position of a frame is displayed on the light transmitting sheet, the frame as well as the embedded item can be fixed. After fixing of the embedded item 8 is complet ed, a specified amt. of concrete 10 is fed in the frame 9 by using a concrete bucket 11, etc. After the concrete is hardened to reach a specified strength, the frame is taken out to complete the concrete sheet.