A library apparatus can reduce the number of motors to be incorporated and can reduce the number of parts for simplification of construction for contributing to down-sizing of the apparatus and reducing cost. The library apparatus of a storage media reads and/or writes information from and in (to) a storage medium housed in a cartridge by withdrawing a desired one of a plurality of cartridges housed within a magazine which is loaded in an apparatus body, by cartridge loading and unloading means and loading the withdrawn cartridge in medium drive means. The cartridge loading and unloading means performs loading and unloading of the magazine to the apparatus body.