To provide a heat insulation sandwich panel excellent in adiabaticity and heat resistance.SOLUTION: There is provided a heat insulation sandwich panel having a heat insulation layer between two surface materials, in which the heat insulation layer is formed from a polyol compound, a foaming agent, a catalyst, a fire retardant containing a phosphinate compound and/or a phosphoro amidate compound, and a polyisocyanate compound.SELECTED DRAWING: None

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