Radial roller bearing

A radial roller bearing comprising:

• an outer race including an outer raceway surface at an inner periphery face thereof, the outer raceway surface having a cylindrical shape whose central axis is a first axis extending in a first direction;
• an inner race including an inner raceway surface at an outer periphery face thereof, the inner raceway surface having a cylindrical shape whose central axis is the first axis;
• a roller group composed of a plurality of rollers that are arranged between the outer raceway surface and the inner raceway surface at intervals in a circumferential direction centered on the first axis;
• a retainer including a pocket group composed of a plurality of pockets, each pocket rollably retaining each roller composing the roller group;
• a first regulating part that regulates movement of the outer race toward one side in the first direction;
• and
• a second regulating part that regulates movement of the outer race toward another side in the first direction,
• wherein movement of the retainer toward the first direction is regulated by a first retainer regulating part of the outer race and a second retainer regulating part of the inner race,
• wherein the first regulating part and the second regulating part are disposed at positions where a distance between the first regulating part and the second regulating part is longer than a length of the outer race in the first direction by at least 2% or more of a length of the retainer in the first direction,
• wherein the rollers and the retainer are fabricated of resin, and
• wherein the pockets retain the rollers in a state in which movement of the rollers in the first direction is regulated, and the rollers are insertable and removable in a direction orthogonal to the first direction.