In order to provide a cellulose-containing olefin-based resin composition having satisfactory moldability and physical properties and a molded object produced from the resin composition, the present invention produces a resin composition by: mixing a nonionic surfactant with a cellulosic raw material that has a degree of cellulose-I crystallinity exceeding 40% to thereby produce a mixed material; mixing and shearing the mixed material using a specific kneader to produce noncrystalline cellulose; and mixing the noncrystalline cellulose with an olefin-based resin.
