Abstract: A computer pointing device includes a conventional computer mouse in combination with an ergonomic extension. The ergonomic extension is attached to the computer mouse for movement therewith and is positioned adjacent to the computer mouse for facilitating use of the mouse by a user in an ergonomically correct position. An adjustment mechanism enables the user to adjust the position of the computer mouse relative to the ergonomic extension for enabling use of the computer mouse and ergonomic extension by users having different size hands. In one embodiment the adjustment mechanism includes an extension arm fixed to the computer mouse; a slot in the ergonomic extension adapted to receive the extension arm; and a lock for releasably locking the extension arm in a desired position in the slot. In another embodiment, the ergonomic extension includes a cavity therebeneath for insertion of a rear portion of the computer mouse.