A bearing apparatus including a rolling bearing having an outer race (11), an inner race (12) and a rolling member (13) disposed between two races, and a thermal sensor (TS) measuring an internal temperature of the rolling bearing. Wiring from the thermal sensor extends to outside via a through-hole (lid) formed in a component of the bearing apparatus, and hence the thermal sensor can be disposed in a desired position with excellent flexibility of wiring extension, and can measure a temperature in the desired position of the bearing. The thermal sensor, which can be constructed thin in a small size having the flexibility, can be therefore incorporated in whatever portion of the bearing and can improve a characteristic of detecting an abnormal temperature with a high response of the temperature detection.