PURPOSE: To obtain the material of high fire-resistance and high heat insulation having high mechanical strength by casting ceramic foams of specified composition and specified void into a fire-resistant castable to carry out formation.

CONSTITUTION: The ceramic foams 2 which consists of the single or the mixture of Al2O3, ZrO2, SiO2 and have 60-90% void are casted into the fire-resisting castable 3 to form into a fire-resisting heat-insulating material. By this method, the low mechanical strength, the defect of ceramic foam, is reinforced by the fire-resisting castable filled around the ceramic foams, and moreover, the high fire-resistance and the low thermal conductivity, the merits of ceramic foam, are kept as it is, so that the material excellent in fire resistance, heat insulation and mechanical strength is obtained.