To provide a water-soluble yellow pigment (a compound) having high solubility to water, excellent in various fastness such as water resistance, moisture resistance, ozone gas resistance, scratch resistance and light resistance, especially ozon gas resistance, to provide a yellow ink composition for various recording, especially inkjet recording, and a colored body which is colored by the ink composition.

There is provided a water-soluble azo compound represented by the formula (1) and a salt thereof. In the formula (1), Q represents a halogen atom, R represents a hydrogen atom, a carboxyl group and the like, x represents an integer of 2 to 4, and n represents an integer of 1 to 5.