Provided is a computer with a case and a plurality of parts, including heat generating components that generate heat when operated, installed in the case, wherein the case includes a plurality of plates, and heat generated by at least one of the heat generating components when operated is transmitted to at least one of the plates via a heat conduction unit, which connects the at least one of the heat generating parts and the plate, and externally dissipated from the case. The heat generating components mounted in the case can be noiselessly and efficiently cooled without a noise-generating cooling fan.