To cool down the inside of a case effectively and to prevent a metal wire or the like effectively from being inserted into the case to cause a short circuit inside or to get an electric shock.

An electric apparatus is equipped with a case 1 where a cooling vent hole 3 is provided. The vent hole 3 is bored so as to penetrate obliquely through the case 1. Furthermore, the electric apparatus is equipped with a partition 4 inside the case 1. The partition 4 is arranged at a position so as to stop a wire from being inserted into the case 3 through the sloping vent hole 3 from outside. Therefore, a metal wire or the like is effectively prevented from being inserted into the case, so that an inner short circuit or an electric shock can be prevented. The vent hole 3 is enlarged in size so as to effectively ventilate the case 1 and to introduce outside air into the case to effectively cool down the inside the case.