DEVICE FOR ASSEMBLING WHEEL HUB UNIT

An assembling device including: a bearing setting unit (12) configured to set a bearing unit (BU) such that the bearing unit is coaxial with respect to a hub cylindrical part (1a) and can be moved toward the hub cylindrical part, a rotational drive source (13) configured to transmit rotational force around an axis to the bearing unit set in the bearing setting unit; and an inner-ring press-fitting unit (14) configured to externally fit a inner rings (2, 3) of the bearing unit to which the rotational force around the axis has been transmitted, to the hub cylindrical part.