There is provided a bearing device in which an inner member and an outer member are connected to each other in a relative rotation relationship through rolling elements. A sealing member may be provided in an end portion of the bearing device so as to prevent an external foreign substance from flowing into the bearing device or prevent lubricant filled in the bearing device from leaking out of the bearing device. The sealing member may comprise a frame constituting a basic body and an elastic sealing portion attached to the frame, and the elastic sealing portion may comprise one or more sealing lips. The one or more sealing lips may comprise a main sealing lip configured to perform a main sealing function and an auxiliary sealing lip located inward of the main sealing lip.