Abstract: A computer input device that comfortably supports the hand of the user while the thumb and fingers are associated with buttons, a trackball, and a scrolling wheel carried on the device. The overall configuration of the device and the arrangement of these actuators permits the user to easily and effectively operate all of the actuators while the hand and arm of the user are in a comfortable position. The device includes a housing having thumb-side and finger-side surfaces. The trackball extends from the thumb-side surface. The finger-side surface includes four input buttons and the scrolling wheel. The thumb-side surface is fairly steep and almost at right angles to the finger-side surface. This helps enable the motion of the thumb to fall along its natural axis of flexion/extension. The thumb-side surface extends above the top of the ball to provide a stop when the thumb is moved inwardly off the ball.