An object of the present invention is to provide an ink composition which has excellent storage stability and has good curing sensitivity regardless of the type of a light source for irradiation, and an ink container. Another object of the present invention is to provide an ink jet recording method which provides a cured image having excellent image gloss even with an LED light source. The ink composition comprises: a radically polymerizable compound; a radical polymerization initiator; and a colorant, and having a dissolved oxygen content of 9 mg/L or more. The ink container, having a gas-impermeable structure and encapsulates the ink composition. The ink jet recording method comprises: a degassing step of reducing a dissolved oxygen between the ink container that stores the ink composition and ink-discharging nozzles; and a discharging step of discharging the degassed ink composition from the nozzles.