A device for estimating a tire wear amount has vehicle speed detection means (15). The speed (V) of a vehicle is detected based on data on the position of the vehicle calculated using a signal coming from a satellite and received by a GPS receiver (11) mounted on the vehicle. The speed (corrected value)(Vw) of a wheel is obtained by correcting a wheel speed Vw0 detected by a wheel speed sensor (12), where the correction of the wheel speed Vw0 is made based on tire inner pressure detected by a pressure sensor (13). The ratio (R=Vw/V) between speeds, or the ratio between the corrected wheel speed (Vw) and the detected vehicle speed (V), is calculated, and the amount of tire wear is estimated based on the speed ratio (R). The amount of tire wear can be accurately measured without working the tread of the tire.
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