To provide a supporting bearing which can be easily positioned relative to a shaft part while preventing the come-off of a cage from a shell outer ring to the axial outside.

In a supporting bearing (4), a cage (7) includes protruded parts (73, 74) protruded from further outside positions than axial end faces (70a, 70b) of each pocket (70) storing at least a rolling element (6) in the outer-diameter direction, and having the protruded portions whose axial outer end faces (73a, 74a) are planes crossing an axial line, and a shell outer ring (5) includes an edge bent part (52) bent at its axial outer end in the inner-diameter direction and facing the axial outer end face (74a) of the protruded part (74) at a predetermined interval.