To provide a precoated aluminium alloy plate having an outstanding heat release nature and applicable also to a case for an electronic device of high generation of heat.

The precoated aluminum alloy plate comprises a precoat layer 2 which is formed on both surfaces or one surface of a substrate 10. The precoat layer 2 comprises a titanium oxide, carbon, silica, a zirconium oxide, and one or more sorts of rust preventive pigments, wherein the integral emissivity of the infrared rays of a wave length of 2.5-25 μm is at least 70%. In addition, the precoat layer uses a synthetic-resin based lacquer and preferably comprises, based on a base resin of 100 pts.wt., 50-200 pts.wt. titanium oxide having 0.1-100 μm average particle diameter, 1-25 pts.wt. fine carbon powder; 50-200 pts.wt. silica, 50-200 pt.wt. alumina, 50-200 pts.wt. zirconium oxide and 2-25 pts.wt. of one or more sorts of rust preventive pigments.

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