Inkjet recording ink, ink cartridge, inkjet recording method, inkjet recording device and ink recorded matter

An inkjet recording ink, comprising:

• water;
• a water-soluble organic solvent;
• a pigment;
• and
• a phosphate group-containing copolymer,
• wherein the phosphate group-containing copolymer comprises a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2):
• where R1 denotes a hydrogen atom or a methyl group;
• M+ denotes an alkali metal ion, an organic amine ion, or a hydrogen ion;
• half or more of M+ in the copolymer is the alkali metal ion or the organic amine ion, the remainder of M+ is the hydrogen ion;
• n and m each denote an integer of 0 to 6, provided that both of n and m are not 0;
• and a block of (C2H4O) and a block of (C3H6O) may be exchanged with each other,
• where R2 denotes a hydrogen atom or a methyl group, wherein the structural unit represented by the General Formula (1) is contained in the phosphate group-containing copolymer in a percentage of 10% by mass to 60% by mass relative to the mass of the phosphate group-containing copolymer.