A color filter manufacturing method that forms low refractive index partition walls using a material easily removable by asking without the need to use fluororesin as a partition wall material; a color filter as a product by such a color filter manufacturing method; and a resin composition suitable for use in such a color filter manufacturing method. The method includes forming partition walls using a bubble-containing resin or resin composition containing bubbles, or the like, and having an inorganic content of 5% by mass or less.