Tapered roller bearing

A tapered roller bearing, comprising:

• an inner ring having an inner raceway surface formed on an outer peripheral surface thereof;
• an outer ring having an outer raceway surface formed on an inner peripheral surface thereof;
• a plurality of tapered rollers arranged between the inner raceway surface of the inner ring and the outer raceway surface of the outer ring;
• and
• a retainer configured to retain the tapered rollers at a plurality of positions in a circumferential direction,
• wherein the retainer comprises:
• a small-diameter-side annular portion;
• a large-diameter-side annular portion;
• and
• a plurality of pillar portions connecting the small-diameter-side annular portion and the large-diameter-side annular portion to each other,
• wherein the tapered rollers are each received in a pocket which is defined by the small-diameter-side annular portion, the large-diameter-side annular portion, and adjacent two pillar portions of the retainer,
• wherein a plurality of projecting portions, which are separated apart from both the small-diameter-side annular portion and the large-diameter-side annular portion in a roller axis direction and are configured to guide the tapered roller on distal end surfaces thereof, are formed on a side surface of each of the pillar portions of the retainer so as to be separated apart from each other in the roller axis direction, and
• wherein the projecting portions each have a force-fit margin.