Coloring property, transparency, and the like which are useful as a coloring agent for a color filter or an ink-jet ink and which can improve the properties such as the dispersibility of the pigment, the dispersion stability, the solubility and the alkali solubility And to provide an excellent resin-treated pigment. Wherein A is a methacrylate having a carboxyl group as a constituent component and B is a methacrylate monomer having a constitutional unit represented by the formula ), Which is a counter ion of a nitrogen cation of quaternary ammonium, and has an ion-binding moiety composed of an organic dye having at least one sulfonic acid ion bonded thereto.
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