A bearing unit includes a radial bearing; a thrust bearing; a path forming member; a housing; viscous fluid; and a communicating path. The communicating path has an axial path formed in the axis direction on a circumferential face of the radial bearing and a second end side path formed on the second end side face of the radial bearing. The second end side path is formed by a plurality of projections formed on one of the second end side face of the radial bearing and a face of the housing opposing to the second end side face of the radial bearing. The cross section of the second end side path has a cross sectional area greater than that of the cross section of the axial path.