To provide a yellow pigment having various fastnesses such as ozone gas resistance, abrasion resistance, light resistance, etc., especially excellent ozone gas resistance and a yellow ink composition that comprises the pigment and is useful for various recordings, especially for inkjet recording.

A disazo compound obtained by a reaction between a water-soluble azo compound represented by formula (E) (wherein x is an integer of 2-4; n is 1 or 2) and, for example, ethylenediamine is exemplified.