Vehicle tire information obtaining apparatus and tire information processing apparatus

A vehicle tire information obtaining apparatus for obtaining tire information (50) relating to a mounted tire (10) and a non-mounted tire (12) of a vehicle. The apparatus includes: (a) tire state detectors (30, 32; 102, 104, 106) which are provided in the respective tires (10, 12) and each of which detects a state of the corresponding tire; (b) transmitters (38) which are provided in the respective tires and which transmit tire data sets (52, 54, 56, 58, 60), as the tire information, each containing at least one tire-state data element (56, 58) representative of the detected state of the corresponding tire; (c) a receiver (70, 78; 196) which is provided in a body (22) of the vehicle and which receives the tire data sets transmitted by the transmitters; and (d) a non-mounted-tire information separator (74; 200, 202; 210; 212) which separates the tire data set transmitted from the non-mounted tire, from the tire data set transmitted from the mounted tire.