Ink-jet ink optimized in terms of composition of specific resin and particle diameter and number concentration of coarse particles

An ink-jet ink containing an aqueous vehicle and pigment particles dispersed in the aqueous vehicle,

• the pigment particle containing a pigment and a specific resin,
• the specific resin being a neutralized product of a copolymer having first repeating units derived from α-methylstyrene, second repeating units derived from styrene, third repeating units derived from (meth)acrylic acid, and fourth repeating units derived from alkylene glycol (meth)acrylate or dialkylene glycol (meth)acrylate,
• wherein respective contents of the first repeating unit, the second repeating unit, the third repeating unit, and the fourth repeating unit in the specific resin are, relative to 100% by mass of all the repeating units, not less than 1% by mass and not more than 65% by mass, not less than 1% by mass and not more than 60% by mass, not less than 10% by mass and not more than 40% by mass, and not less than 1% by mass and not more than 12% by mass, respectively, and
• a number concentration of coarse particles having a diameter of not less than 0.5 μm and not more than 1.0 μm in the ink-jet ink is not more than 1500×105/mL.