An inkjet ink that prevents paper deformation such as curling, and also exhibits favorable pigment dispersibility. The inkjet ink includes at least a pigment, water, a water-soluble organic solvent having an .alpha. value of not more than 65, and a dispersant, wherein the dispersant is a copolymer having a unit A represented by general formula (a) shown below and a unit B represented by general formula (b) shown below, and the mass ratio between the water-soluble organic solvent and the water satisfies (water-soluble organic solvent)/water=5/5 to 8/2. ##STR00001## [In general formula (a), R.sub.1 represents a hydrogen atom or a lower alkyl group, and m represents an integer of 1 to 3.] ##STR00002## [In general formula (b), R.sub.2 and R.sub.3 each represents a hydrogen atom or a lower alkyl group, wherein R.sub.2 and R.sub.3 may be the same or different, and n represents an integer of 1 to 250.]