To provide a resin composition for coating capable of having a high quality finishing coating film, and which is excellent in dispersion stability of pigments in the wide range and keeping colors brightness and transparency of dispersion paste when producing the coating.

The resin composition for coating contains a modified vinyl copolymer containing a quatermary ammonium base (A) which coplymerizes a mixture of (a) of 50-90 wt.%, (b) of 0.05-5.0 wt.% and (c) of 45-9.95 wt.%. Wherein, (a) means cellulose acetate butyrate containing a vinyl group obtained by reacting cellulose acetate butyrate (i) with a compound containing an isocyanate group and a vinyl group in a molecule, (b) means vinyl monomer containing a quatermary ammonium base, and (c) means an other polymerizable vinyl monomer.