To make it possible to prevent the degradation in productivity by enabling the utilization of setter of the conventional dimensions and sizes in spite of flat plate type clay roof tiles provided with snow guard projections of a large projection height on their front surfaces.

The flat plate type clay roof tile 2 having the snow guard projection 21 is placed on the lower setter 3 and further, the upper setter 3a is stacked thereon in such a manner that their legs 31 and 31a are aligned one above the other and that the flat plate type clay roof tile is placed thereon. The side edge portions 34 of the setters 3a corresponding to the positions of the snow guard projections 21 of the flat plate type clay roof tiles 2 placed right below the flat plate type clay roof tiles placed thereon when these setters and the flat plate type clay roof tiles are stacked stepwise to plural stages are provided with notched recessed parts 32 not interfering with the projections 21.