A computer case includes a primary frame body formed from a plurality of primary supports, a cover case mounted on the outside of the primary frame body, and a power supply coupled to the rear area of the primary frame body. The computer case preferably also includes a power supply support frame so that the power supply can be fixed, in a steady manner, onto the primary frame body. In addition, for the ornamental purposes, an ornamental case can be coupled to the outside of the power supply.