Aqueous pigment dispersion

A process for producing a pigment water dispersion comprising pigment-containing water-insoluble crosslinked polymer A particles, a water-soluble basic compound and water, said process comprising:

• Step I:
• subjecting a mixture comprising a carboxy group-containing water-insoluble polymer A′, a water-soluble basic compound and water to dispersion treatment to obtain a polymer dispersion;
• Step II:
• adding a pigment to the polymer dispersion obtained in the step I and then subjecting the resulting mixture to dispersion treatment to obtain an aqueous pigment dispersion solution;
• and
• Step III:
• adding a water-insoluble crosslinking agent to the aqueous pigment dispersion solution obtained in the step II to subject the polymer to crosslinking treatment, thereby obtaining the pigment water dispersion,
• in which a saponification value of a water-insoluble crosslinked polymer A constituting the particles is not less than 170 mgKOH/g and not more than 300 mgKOH/g;
• and
• the water-soluble basic compound in the pigment water dispersion comprises a water-soluble amine compound.