To provide a roller bearing with a separator cage whose seizure or abnormal wear is prevented even when lubrication is scarce by surely feeding lubricating oil thereinto.

A first oil feed groove 31 is provided through a body 10 of the separator cage 4 in the radial direction or along the face of the body 10 for feeding lubricating oil. A second oil feed groove 32 is provided in the outer diameter side of an outer ring side rib portion 11 of the separator cage 4. A third oil feed groove 33 and a fourth oil feed groove 34 are provided in a range from the second oil feed groove 32 to the body 10 in sequence. A fifth oil feed groove 35 is provided in an inner ring side rib portion 12 of the separator cage 4. Similarly, sixth to ninth oil feed grooves 36-39 are provided in the other side of a roller 3 for feeding the lubricating oil.