This invention relates to a powder composition comprising a silicone represented by the following formula (1) comprising an alcoholic hydroxyl group, and a powder, to an oil-based powder composition formed by dispersing this powder composition in an oil, and to a cosmetic material containing these materials. R.sup.1.sub.aR.sup.2.sub.bR.sup.3.sub.cSiO.sub.(4-a-b-c)/2 (1) where, in formula (1), R.sup.1 are identical or different organic groups selected from alkyl groups, aryl, aralkyl or fluorinated alkyl groups having 1-30 carbon atoms, R.sup.2 is a substituent having one or more alcoholic hydroxy groups, R.sup.3 is a group represented by the following general formula (2), ##STR00001## and a, b, c, d are integers satisfying the relations: 1.0.ltoreq.a.ltoreq.2.5, 0.01.ltoreq.b.ltoreq.1, 0.001.ltoreq.c.ltoreq.1, 1.5.ltoreq.a+b+c.ltoreq.2.6, and 0.ltoreq.d.ltoreq.500. The powder composition of this invention has little cohesion, excellent dispersibility and excellent stability over time as an oil-based powder composition. Therefore, cosmetics using these materials have excellent stability in use, and excellent stability over time.