Roller bearing and shaft support structure

A roller bearing comprising:

• a plurality of rollers;
• a cage that retains the rollers;
• and
• an outer ring that has a rolling surface on which the rollers roll and is split in a circumferential direction, wherein
• the cage includes a split section at which the cage can be split in the circumferential direction,
• the cage includes split cage members split by the split section,
• the split cage members include radially inner roller stoppers and radially outer roller stoppers to prevent the rollers housed in pockets from falling off,
• the radially inner roller stoppers, which are integral with the split cage members and located to face each other, are formed so as to project from an inner side of wall surfaces of a pocket in the circumferential direction,
• the radially outer roller stoppers, which are integral with the split cage members and located to face each other, are formed so as to project from an outer side of wall surfaces of a pocket in the circumferential direction,
• the radially inner roller stoppers are formed so as to project toward the pocket by an amount more than an amount by which the radially outer roller stoppers project toward the pocket, and
• the cage is of a roller riding type or an inner land riding type.