Roller bearing

A roller bearing comprising:

• an outer member having a cylindrical outer ring raceway on an inner circumferential surface thereof;
• an inner member having a cylindrical inner ring raceway on an outer circumferential surface thereof;
• a plurality of rollers that are rollably provided between the outer ring raceway and the inner ring raceway;
• a holder that holds the rollers at predetermined intervals in a circumferential direction thereof, wherein an entirety of the holder is formed in a cylindrical shape, the holder has pockets that respectively house the rollers, at predetermined intervals in the circumferential direction, and the holder includes:
• pillar parts between the pockets adjacent to each other in the circumferential direction, and annular parts on both sides in an axial direction of the pillar parts;
• inner protrusions on an inner diameter side on both sides in the axial direction of the pillar parts, wherein the inner protrusions have a size and location that prevents the rollers from coming off the holder;
• and
• outer protrusions on an outer diameter side on both the sides in the axial direction of the pillar parts, wherein the outer protrusions have a size and location that prevents the rollers from coming off the holder;
• wherein the holder with the rollers therein is located between the outer ring raceway and the inner ring raceway, and the inner protrusions and the outer protrusions on the pillar parts do not contact the rollers.