of the device fig8 illustrates the relationship between the flow path 323 of the heat radiating member 320 and the outlet 27 as illustrated in fig8 the plurality of fins 320 a in the heat radiating member 320 of the heat sink 300 are provided extending upward in the thickness direction of the main body unit 20 and arrayed on the other hand the slits 27 a provided in the outlet 27 are formed to be oblique with respect to the thickness direction of the main body unit 20 therefore upon the heat radiating member 320 of the heat sink 300 is arranged facing the outlet 27 the flow path 323 of the heat radiating member 320 is divided by the slit 27 a of the outlet 27 fig9 is an enlarged view around the outlet 27 of the main body unit 20 with the heat sink 300 as illustrated in fig9 the flow path 323 formed by the fins 320 a of the heat sink 300 is divided by the slit 27 a this can prevent a malfunction in which a failure of the personal computer is caused by foreign matter such as trash entering from the outlet 27 an accident in which a screwdriver or the like is inserted from the outlet 27 to short circuit the electronic component 500 and so on the example embodiment is designed so that the pitch width w 1 of adjacent fins 320 a is smaller than the width w 2 of the slit 27 a as a result the hot air having gone through the flow path 323 is efficiently discharged from the outlet 27 moreover an example embodiment prevents intrusion of foreign matter entering from the outlet.