Abstract: Disclosed is a heat radiation sheet, including a thermoconductive adhesive layer, a thermal diffusion layer, an adiabatic adhesive layer formed on the thermal diffusion layer, and a graphite layer. The thermoconductive adhesive layer is formed by mixing a metal powder with a nonconductive resin adhesive, the thermal diffusion layer is formed of metal foil, and the adiabatic adhesive layer is formed by mixing a metal powder with a nonconductive resin adhesive. The heat radiation sheet is effective in that high-temperature heat generated from heat sources of various kinds of electronic appliances is rapidly absorbed by a thermoconductive adhesive layer and a thermal diffusion layer, and the absorbed heat rapidly spreads over the entire area of the heat radiation sheet, is stored, and is then slowly discharged to prevent the external temperature of the electronic appliance from rapidly increasing, preventing the deterioration of reliability attributable to the high-temperature heat.