1. An electronic apparatus comprising:a first printed circuit board, a second printed circuit board and a plurality of devices including a nonvolatile memory package and a controller package configured to control the nonvolatile memory package, the controller package being mounted on the first printed circuit board;
a spacer with a first slit, the spacer being interposed between the first and second printed circuit boards; and
a housing accommodating the first and second printed circuit boards and the spacer, the housing including an opening on a surface constituting the housing, wherein
the first slit is placed between the opening and an encryption device among the plurality of devices and the first slit directs an air flow from the opening into an inside of the spacer,
the encryption device is present in a first region, the encryption device being a device used for an encryption process of data to be stored into the nonvolatile memory package,
the first printed circuit board contains the first region and a second region, the first region being a region that is not irradiated with light emitted from a light source placed at the opening, and the second region being a region that is irradiated with the light emitted from the light source at the opening, and
the first region and the second region are defined by the spacer.