To provide a yellow pigment having a hue with a high clarity suitable for an inkjet-recording, also having high various fastness of recorded matter, and excellent in preservation stability of an ink composition on preparing the ink composition, and the ink composition containing the same.

A water soluble azo compound expressed by formula (1) or a salt thereof is provided. Also, the ink composition having the clarity and hue suitable for the inkjet-recording, having various fastness of the recorded matter and also excellent in preservation stability etc., of the recorded images is obtained by using the ink composition containing the compound.