Bearing unit for railway vehicle

A bearing unit for a railway vehicle, which is disposed in an axle box (2)disposed at each of opposite ends of an axle (3) of a railway vehicle, includes an inner ring (4) secured to the axle; an outer ring (5) disposed outside the inner ring, and secured to the axle box; and rolling elements (6) rollably disposed between the inner ring and the outer ring. A displacement-load sensor (16) is disposed at an inner peripheral surface of the outer ring.