An ink for inkjet recording includes water, a water-soluble solvent, a pigment and a copolymer including a salt of phosphonic acid group. The copolymer including a salt of phosphonic acid group includes structural units having the following formulae (1) and (2) or (3): wherein not less than half or all of M+ represent a cation of alkali metals or an organic ammonium ion, and the rest represents proton; wherein Ar1 represents a monovalent group of benzene or naphthalene; and wherein R1 represents an alkyl group having 5 to 20 carbon atoms.