Dry solid of anion-modified cellulose nanofiber and method for producing same

In the present invention, when producing a dry solid of anion-modified cellulose nanofibers, the anion-modified cellulose nanofibers are caused to contain 5-300 mass% of a water-soluble polymer, and thus a dry solid of the anion-modified cellulose nanofibers having favorable redispersion properties.