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PROBLEM TO BE SOLVED : To provide a method with which a silylated cellulose can be produced under more moderate reaction conditions.SOLUTION : A method of producing a silylated cellulose includes reacting a pre-processed cellulose, an acid catalyst, and a silylating agent that is, for example, represented by formula (1) at 0-55°C and 0.08-0.11 MPa. (Rto Rare the same or different and are C1-4 lower alkyl groups, C1-4 lower alkenyl groups, or an aryl group; and Ris H)