To provide a bearing device capable of preventing deterioration of radial rigidity of a housing and reducing manufacturing costs by heightening detection accuracy.

An outer ring spacer 5 interposed between outer rings 3g, 3g has a plurality of split spacers 6A, 6B aligned in an axial direction, and a variable part 7 changing in a contact area according to a magnitude of a load and an ultrasonic sensor 10 are provided between the split spacers 6A and 6B.