PROBLEM TO BE SOLVED: To provide boiled barley with "hay smell" and "harshness" suppressed.SOLUTION: A manufacturing method of boiled barley adjusting primary immersion yield more than 175% includes: a primary immersion step of soaking polished barley of glutinous barley in water a step of draining water from the soaked polished barley, adding water, and boiling and a step of freezing the boiled barley.