PROBLEM TO BE SOLVED: To provide a method for producing cellulose nanofiber-supported silica, a resin composition containing cellulose nanofiber-supported silica, a rubber composition, a resin and rubber. SOLUTION: (1) A step of adding an acid to an aqueous solution of sodium silicate to liberate silicic acid and adding ammonia to obtain a silica gel slurry, and (2) to the silica gel slurry obtained in the above step (1). A step of adding a cellulose nanofiber aqueous dispersion and a silicon atom-containing hydrophobic agent to obtain a slurry containing the cellulose nanofiber and a silicon atom-containing hydrophobic agent, and (3) the cellulose nano obtained in the step (2) above. A method for producing cellulose nanofiber-supported silica, which comprises a step of filtering a slurry containing a fiber and a silicon atom-containing hydrophobicizing agent and drying the slurry to obtain cellulose nanofiber-supported silica gel. [Selection diagram] None
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