Abstract: An object of the present invention is to provide an oil-impregnated sintered sliding bearing which has a large amount of the lubricating oil as a bearing element which has long life, has a small amount of scattered and lost lubricating oil, has a simple structure, and takes up a small space for a bearing. An oil-impregnated sintered sliding bearing includes: an axis; plural porous sintered compacts joined with each other by sizing; a cavity between the sintered compacts at an axial direction center portion; and a gap which continuously extends from an end portion of the cavity and has a width narrower than the cavity, wherein the gap opens to an end surface or a peripheral surface of the bearing.