A device installation apparatus for a mobile body is disposed in a position sandwiched between a driver's seat 107a and a assistant driver's seat 197b in an automobile vehicle 100, and is constituted by a center console box 109, as an installing means, movable along a rail portion 110, in which a desired device such as a CD player 201, a cassette tape player 202, a DVD player 203 or the like can be installed. Having been constituted as above, it allows passengers seated other than in front seats an easy access to the desired device 200, remarkably improving the convenience of the apparatus.