To provide a roof tile to be comparatively high in the efficiency of formation of a heat insulation layer and a yield, reduce the occurrence of a defect, such as a strain, to a product to form a heat insulation layer, and further reduce the occurrence of unevenness in density to a product or a systematic defect, such as a crack, to form a heat insulation layer.

A plurality of plate-form substances are integrally laminated together through an adhesive and a topmost layer plate-form substance 30 of a plurality of the plate-form bodies consists mainly of cement and is formed by curing and hardening. When the topmost layer plate-form substance is arranged on a roof substrate, a heat insulation layer extending in parallel to the plate-form substance is formed by heat insulation forming means 40, 41, and 42 formed in a layer lower than the topmost layer plate-form substance 30.