A bush bearing (1) comprising a winding bush bearing provided with a tubular inner circumferential surface (2) serving as a sliding surface and an outer circumferential surface (3) butting each other on a butting surface (4). The outer circumferential surface (3) comprises a tubular surface (11), a tapered surface (13) formed between the tubular surface (11) and one annular end face (12) in the axial direction X by roll forming, a smooth arcuate surface (14) interposed between the tapered surface (13) and the tubular surface (11), and a smooth arcuate surface (15) interposed between the tapered surface (13) and the end face (12).
