Problems The present invention provides an ink composition which, when applied as an ink-jet recording solution to plain paper and processed glossy paper, assumes vivid yellow color and gives printed material excellent in light fastness, gas fastness and moisture fastness. Means for Solving the Problems Ink-jet printing with an ink-jet ink composition containing a disazo compound represented by the following formula (1) can give a vivid yellow-colored product excellent in light fastness, gas fastness and moisture fastness (in the formula (1), X represents specific diamine residue; and Y1 and Y2 each represent an alkylamino group substituted with a sulfonic acid group and/or a carboxyl group, a phenoxy group substituted with a sulfonic acid group and/or a carboxyl group and an anilino group substituted with a sulfonic acid group and/or a carboxyl group).