Sensor-mounted roller bearing apparatus

A roller bearing apparatus (2) having a fixed bearing ring (3), a rotary bearing ring (5), and rolling elements (6,7) rollably provided between the bearing rings. Piezoelectric elements (13a,13b,13c,13d,14a,14b,14c,14d) are provided in the form of a film interposed between the fixed bearing ring and a fixing part to which the fixed bearing ring is fixed so as to detect loads applied between the fixed bearing ring and the fixing part.