To achieve a uniform cell gap and prevent the degradation in seal quality such as seal separation without being affected by the uneven thickness or warping of substrates in a process for laminating substrates of a liq. crystal cell.

A cell is formed by mounting a vacuum chuck 2 on jacks 5 which are individually moved vertically by a control circuit 4, fixing the lower substrate 7 coated with a sealant 9 by suction onto the chuck 2, individually moving, while the cell gap is being measured with a range finder 3, jacks 5 vertically according to the measured value of the gap to correct the deviation in the cell gap, bringing the upper and the lower substrate 7, 8 close to each other while the cell gap is being corrected as above and curing the sealant 9.