A notebook computer 1 is provided with: a casing in which a CPU is accommodated; a heat-dissipating component 37 having a plurality of fins; and a fan 31, and operates such that heat transferred from the CPU to the heat-dissipating component 37 is heat-exchanged with air supplied from the fan 31, and released to the exterior of the casing. The heat-dissipating component 37 is disposed at an air outlet 32b of the fan 31. An opening 35 is formed, between the air outlet 32b and a fan main unit 33, in a fan case 32. First shutter means 39 is provided on a discharge outlet surface of the heat-dissipating component 37. With this structure, increase in cost and weight can be restrained, and dust on the heat-dissipating component can be removed with a simplified structure.