According to the present invention, there is provided a wheel identifying apparatus for a vehicle which includes a transmitter, a signal strength determiner, a variation determiner, and a wheel identifier. The transmitter is located on the body of the vehicle and working to transmit a signal during running of the vehicle. The signal strength determiner is located on a wheel of the vehicle away from the rotational axis of the wheel and works to determine strength of the signal thereat. The variation determiner works to determine a variation in the strength of the signal determined by the signal strength determiner. The wheel identifier is configured to identify the wheel as a spare wheel located on the body of the vehicle when the variation determined by the variation determiner is substantially zero.