Thrust roller bearing

A thrust roller bearing, comprising:

• a plurality of rollers arranged between a first raceway surface and a second raceway surface that face each other;
• and
• a cage having a plurality of cage pockets each holding the roller such that a central axis of the roller extends in a radial direction, the roller including a cylindrical outer peripheral surface, a first end face on a radial outer side, and a second end face on a radial inner side, and the cage pocket including an outer surface having a protrusion that is contactable with the first end face, an inner surface facing the second end face, a first side surface on one side and facing the cylindrical outer peripheral surface, and a second side surface on the other side and facing the cylindrical outer peripheral surface, wherein
• the rollers and the cage are configured to satisfy the following expression (1)
• (Y1+Y2)/X<tan(3×π/180) (1)
• where
• Y1 represents a clearance, before skewing, between a first contact point of the roller at which the roller contacts the first side surface when the roller is skewed toward one side and the first side surface,
• Y2 represents a clearance, before skewing, between a second contact point of the roller at which the roller contacts the second side surface when the roller is skewed toward the one side and the second side surface, and
• X represents a difference between a radius of a first imaginary circle about a central axis of the cage that passes through the first contact point and a radius of a second imaginary circle about the central axis of the cage that passes through the second contact point.