A tire wear measurement device detects a magnetic field of a magnetic body embedded in a tread portion of a tire and measures the degree of wear of the tire from a change in the magnetic field. The tire wear measurement device includes a first magnetic field detection portion placed at a position at which the magnetic field of the magnetic body can be detected, and a second magnetic field detection portion disposed at a position at which the intensity of the magnetic field of the magnetic body differs from the intensity at the position at which the first magnetic field detection portion is disposed.