To provide a heat-resistant insulating laminate capable of being safely produced and used without obstructing health of a manufacturer or a consumer and having heat resistance far more excellent than that of a conventional product.

A mixture layer powder, prepared by adding 30-350 pts.wt. of a heat-resistant inorg. powder or both of this powder and a graphitized org. powder to 100 pts.wt. of a thermosetting resin powder is added to the surface of a sheet like reinforcing material composed of carbon fibers or aluminum oxide fibers and the whole is heated and pressed to form a sheet-like material having 35-97 wt.% per the total wt. of the mixture layer temporarily bonded to the surface thereof. Subsequently, a plurality of the sheet-like materials are stacked to be heated and pressed to be fused integrally to produce a heat-resistant insulating laminate.