We report the first successful measurement ( with HST/WFPC2 ) of a significant proper motion for a m _ { V } \sim 25 object which we had proposed as the optical counterpart of the radio pulsar PSR B0656+14 .
The yearly displacement of 43 \pm 2 mas is highly significant and , while in agreement with early , rougher , radio measurements , stands out for its vastly improved accuracy .
Together with the report of a possible optical pulsation ( 15 ) , we regard this result as the final proof of the optical identification of PSR B0656+14 .