Oil coating roller, seal ring used for the roller, and fixing device using the seal ring

The present invention relates to an oil application roller for applying release oil to a fixing roller of a fixing device for use in monochrome printers, color printers, copying machines, facsimile machines, etc. The present invention also relates to a seal ring for use in the oil application roller and a fixing device using the oil application roller. An oil application roller capable of preventing an oil leak when the roller is left in the state where the rotation axis thereof runs vertically and also capable of preventing an oil escape from the roller in a fixing device. The oil application roller () includes a seal ring () at respective end portions of the roller (). The seal ring () includes a vent hole () extending from an end face of the roller () to the outside of the seal ring (), and the cross-sectional area of the vent hole is not less than 0.01 mmand not more than 1 mm.