To provide an inkjet ink composition which is storage-stable, not liable to cause nozzle clogging, enables a stable ink jetting for a long period of time and is manufactured without going through a complicated refining process.

The inkjet ink composition comprises four kinds of materials; an organic pigment, a pigment derivative in which a sulfonic acid group is introduced into an organic pigment and/or a pigment of the same kind with the organic pigment, a polymer dispersant containing a side chain having an amino group, a hydrophilic side chain and a hydrophobic side chain and water.