To provide a water-soluble yellow pigment (compound) having high solubility to water and excellent in a variety of fastness such as water proofness, moisture proofness, ozone gas resistance, wear resistance, and light resistance, and specifically excellent in the ozone gas resistance, and to provide a yellow ink composition for printing specifically for ink-jet printing including the same, and a colored body colored by the ink composition.

Provided is a water-soluble azo compound expressed by a formula (1) below, or a salt thereof. (In the formula, Q represents a halogen atom, and x and y independently represent an integer of 2-4.)