A slide bearing, a slide bearing assembly and a small motor with a slide bearing assembly which are comparable to or even better than conventional sintered oil-impregnated bearings in mechanical strength, stability of friction coefficient, and which are small and lightweight. The bearing assembly includes a housing having a circular hole and a through hole for supporting a rotary shaft and integrally formed from a resin composition comprising 20-40% by weight of a synthetic resin such as polyphenylene sulfide, 20-60% by weight of an inorganic filler such as mica, 10-30% by weight of a fibrous reinforcing material such as carbon fiber, 3-7% by weight of a lubricating oil such as fatty acid ester oil, and 1-5% by weight of an oil retaining material such as talc. There is also provided a slide bearing formed from the same resin composition as above. There is also provided a small motor having the above slide bearing assembly, a stator carried by the housing of the bearing assembly, and a rotor having a rotary shaft supported by the slide bearing of the bearing assembly.