Resin foam composition and foam, and wallpaper

A resin foam composition comprising:

• a resin emulsion comprising:
• a solvent comprising water, the solvent does not contain an organic solvent;
• a resin dispersed in the solvent, the resin comprises a polyurethane resin;
• cellulose nanofibers dispersed in the solvent;
• and
• particles or fillers,
• wherein the cellulose nanofibers have an average fiber width within a range of 1-200 nm,
• wherein the particles or fillers are present in an amount of not larger than 200 parts by mass per 100 parts by mass of the resin,
• wherein a foaming agent is present in an amount of not larger than about 30 parts by mass per 100 parts by mass of the resin,
• wherein a total amount of the resin is 10 to 33 mass % when the resin foam composition is taken as 100 mass %,
• wherein an amount of the cellulose nanofibers in the resin foam composition is within a range of about 0.2-50 parts by mass, per 100 parts by mass of the resin;
• and wherein the cellulose nanofibers are modified with a carboxyl group, with an amount of the carboxyl group being within a range of about 0.1-3.5 mmol/g.