Polishing solution and polishing method

A polishing liquid comprising:

• abrasive grains containing a metal oxide;
• at least one hydroxy acid compound selected from the group consisting of a hydroxy acid having a structure represented by General Formula (A1) below and a salt thereof;
• and water:
• wherein in the formula, R11 represents a hydrogen atom or a hydroxy group, R12 represents a hydrogen atom, an alkyl group, or an aryl group, n11 represents an integer of 0 or more, and n12 represents an integer of 0 or more;
• however, a case where both of R11 and R12 are a hydrogen atom is excluded and a case where R11 is a hydrogen atom, R12 is a methyl group, n11 is 0, and n12 is 0 is excluded, and
• a ratio of a content of the hydroxy acid compound with respect to a content of the abrasive grains is 0.01 to 0.50.