To provide a rolling bearing device capable of effectively preventing occurrence of creep and fretting between a rolling bearing and a housing mounted with the rolling bearing.

In the rolling bearing device 100 comprised of a housing 30, a housing hole 30a formed in the housing 30, the rolling bearing 10 mounted in the housing hole 30a, and a bearing cover 24 for fixing the rolling bearing 10, between an inner circumferential surface 30b of the housing hole 30 and an outer circumferential surface of the rolling bearing 10, a bellows-shaped elastic body 22 formed with peak parts 22c and trough parts 22d continuously is interposed while being compressed and deformed in the axial direction of the rolling bearing 10.