A process for producing a readily dispersible cellulose composition having an improved dispersibility of cellulose in a resin, the process comprising: dissolving a polymer dispersant having a block copolymer structure comprising a resin-affinitive segment A and a cellulose-adsorptive segment B in a hydrophilic organic solvent solution; adding a surface active agent to the resultant solution; thereafter adding water to the resultant mixture to prepare an aqueous dispersion treatment agent comprising the polymer dispersant; and adding the obtained aqueous dispersion treatment agent to cellulose in a water-containing state or in a dry state, thereby obtaining a readily dispersible cellulose composition; wherein the polymer dispersant further satisfies all of the following requirements to: 90% by mass or more of constituents of the A-B block copolymer is constituted by a methacrylate-based monomer or methacrylate-based monomers; 50% by mass or more of constituents of the cellulose-adsorptive segment B is constituted by a methacrylate-based monomer having one or more hydroxy groups and/or a methacrylate-based monomer having a urea group, and the cellulose-adsorptive segment B does not have compatibility with resins; the resin-affinitive segment A has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the resin-affinitive segment A in the whole A-B block copolymer is 5 to 95% by mass; the cellulose-adsorptive segment B has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the cellulose-adsorptive segment B in the whole A-B block copolymer is 5 to 95% by mass; and the A-B block copolymer has a number average molecular weight of 1000 to 40000 in terms of polystyrene in gel permeation chromatography and a molecular weight distribution index (weight average molecular weight/number average molecular weight) of 1.0 to 1.6. dissolving a polymer dispersant having a block copolymer structure comprising a resin-affinitive segment A and a cellulose-adsorptive segment B in a hydrophilic organic solvent solution; adding a surface active agent to the resultant solution; thereafter adding water to the resultant mixture to prepare an aqueous dispersion treatment agent comprising the polymer dispersant; and adding the obtained aqueous dispersion treatment agent to cellulose in a water-containing state or in a dry state, thereby obtaining a readily dispersible cellulose composition; wherein the polymer dispersant further satisfies all of the following requirements to: 90% by mass or more of constituents of the A-B block copolymer is constituted by a methacrylate-based monomer or methacrylate-based monomers; 50% by mass or more of constituents of the cellulose-adsorptive segment B is constituted by a methacrylate-based monomer having one or more hydroxy groups and/or a methacrylate-based monomer having a urea group, and the cellulose-adsorptive segment B does not have compatibility with resins; the resin-affinitive segment A has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the resin-affinitive segment A in the whole A-B block copolymer is 5 to 95% by mass; the cellulose-adsorptive segment B has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the cellulose-adsorptive segment B in the whole A-B block copolymer is 5 to 95% by mass; and the A-B block copolymer has a number average molecular weight of 1000 to 40000 in terms of polystyrene in gel permeation chromatography and a molecular weight distribution index (weight average molecular weight/number average molecular weight) of 1.0 to 1.6. 90% by mass or more of constituents of the A-B block copolymer is constituted by a methacrylate-based monomer or methacrylate-based monomers; 50% by mass or more of constituents of the cellulose-adsorptive segment B is constituted by a methacrylate-based monomer having one or more hydroxy groups and/or a methacrylate-based monomer having a urea group, and the cellulose-adsorptive segment B does not have compatibility with resins; the resin-affinitive segment A has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the resin-affinitive segment A in the whole A-B block copolymer is 5 to 95% by mass; the cellulose-adsorptive segment B has a number average molecular weight of 500 to 20000 in terms of polystyrene in gel permeation chromatography, and a ratio of the cellulose-adsorptive segment B in the whole A-B block copolymer is 5 to 95% by mass; and the A-B block copolymer has a number average molecular weight of 1000 to 40000 in terms of polystyrene in gel permeation chromatography and a molecular weight distribution index (weight average molecular weight/number average molecular weight) of 1.0 to 1.6.