Abstract: A computer keyboard/mouse support apparatus including a keyboard support having three layers which are rigidly sandwiched together is disclosed. The top layer is for supporting a keyboard while the bottom layer is for attachment to a keyboard arm. The center layer has a surface area which is substantially less than that of the top and bottom layers so that it defines a gap in which left and right mouse extensions pivot between extended usable positions and retracted stored positions. In their extended usable positions, the front edges of the keyboard support and the mouse extensions are flush with each other and define an ergonomic curve. The top surface of each mouse extension also preferably frictionally engages the underside surface of the keyboard support so that the extensions are not easily moved by the user when moving a mouse supported on the surface of the extension.