In a disk array apparatus according to an aspect of the invention, temperatures of disk drives arranged in a casing are equalized to reduce a noise. A disk array apparatus 50 comprises plural disk drives 2, fans 5, and a casing 1. The disk drives 2 are arranged in an array, the fans 5 are provided on one end side of rows of the disk drives, and the casing 1 accommodates the disk drives 2 and the fans 5. Air which has already cooled the disk drives flows through an air duct 10. A sub-fan 6 exhausts the air flowing through the air duct to the outside of the casing 1. A nozzle 11 is arranged in a front end portion of the air duct. One end portion of the nozzle 11 is arranged between the disk drives.