To provide a housable auxiliary table in a rack, etc., for a personal computer.

In the rack, etc., for the personal computer wherein a top plate thinner than a horizontal frame is successively provided on the inner side of the horizontal frame so as to flush the upper surfaces of both, a pair of guide rails 4 are extended in the direction of crossing the horizontal frame 2b on the lower side of the top plate 3a, a table plate 5 is arranged between the guide rails 4 approximately at the height of the lower surface of the horizontal frame 2b, the guide rails 4 are fitted to horizontal grooves 5a engraved on the side walls of the table plate 5 and the table plate 5 is supported freely slidably along the guide rails 4. Also, the guide rails are provided over the entire width of the top plate.