In a storage device accommodating a plurality of memory devices in a general-purpose chassis provided from both surface sides thereof, a cooling device is provided on the front of the memory devices. This cooling device is allowed to freely move to leave available the area in front of the memory devices, thereby enabling maintenance and replacement of the memory devices from the both surface sides of the chassis. With such a storage device of a type using a general-purpose chassis, and inserting therein a plurality of memory devices from the both surface sides thereof, even if a cooling device is located on the front of the chassis, the memory devices can be subjected to maintenance and replacement.