The invention proposes a cooling structure of a storage apparatus in which cooling air in a chassis is stirred or evened out without affecting the layout in the chassis. The storage apparatus includes fan devices that introduce outside air to heat areas generated from heat generating members arranged on a logical substrate which constitutes a controller unit section for inputting and outputting a data to and from a hard disk drive in response to a data I/O request from a host system, cool the heat areas by stirring the cooling air therein or by causing the cooling air to blow evenly thereon, and discharge the outside air passed through the heat areas to the outside.