Cylindrical roller bearing

In a cylindrical roller bearing (10), the inner wall surface of each of a pair of circular ring sections (22) forming a pocket section (21) has formed therein a single groove (25) which at least faces the center point (O) of a roller end surface (13a) of a cylindrical roller (13) and which is open from the inner peripheral surface to the outer peripheral surface of the circular ring section (22). The groove (25) is separated in a circumferential direction from a pocket corner section (26) between the circular ring sections (22) and a column section (23). As a result, satisfactory lubrication properties in oil-air lubrication and grease lubrication are provided, and the skew of cylindrical rollers can be prevented. 在圆柱滚子轴承(10)中，在形成兜孔部(21)的一对圆环部(22)的各内壁面形成有单个凹槽(25)，该凹槽至少与圆柱滚子(13)的滚子端面(13a)的中心点(O)对置，且从圆环部(22)的内周面开口到外周面。凹槽(25)从圆环部(22)与柱部(23)之间的兜孔角部(26)向圆周方向隔开。由此，即使在油气润滑、润滑脂润滑时也具有良好的润滑性，而且能够抑制圆柱滚子的偏斜。