The present invention provides a stabilizer for stable retention and/or immobilization of grains of flesh, etc. of foods, a thickening agent capable of imparting viscosity through addition of a small amount thereof, and a gelling agent having excellent heat resistance. The present invention provides a composition comprising a polysaccharide and a highly dispersible cellulose complex composed of a hydrophilic substance, a water-soluble polymer and a water-dispersible cellulose being fine-fibrous cellulose from plant cell walls as a raw material. Further, there are provided a stabilizer, thickening and gelling agent comprising the above composition.