Chain guide and chain transmission device

A chain guide comprising:

• a guide base including an opposed pair of side plates elongated in one direction and configured to be arranged along a portion of an outer periphery of a timing chain such that the one direction coincides with a direction in which the timing chain moves, wherein each of the side plates is formed with shaft engaging portions that are opposed to the respective shaft engaging portions of the other of the side plates;
• a plurality of roller shafts arranged spaced apart from each other in a length direction of the side plates, and having end portions supported by the respective shaft support portions;
• and
• a plurality of rollers rotatably supported by the respective roller shafts and configured to guide the timing chain, wherein the rollers comprise roller element bearings each including an outer race and a plurality of roller elements mounted in the outer race,
• wherein oil guide holes are formed in each of the side plates at or around the respective shaft engaging portions to extend through the side plate from an inner side surface to an outer side surface, of the side plate.