Provided is a method for manufacturing an effervescent beverage having an improved grain flavor irrespective of the malt content of a raw material in the effervescent beverage. A method for manufacturing an effervescent beverage, having a sugar-solution-preparation step for preparing a sugar solution, an amino acid addition step for adding proline to the sugar solution, and a boiling step for proline-added sugar solution, makes it possible to produce numerous flavor components contributing to the grain flavor of the effervescent beverage and to improve the grain flavor of the effervescent beverage. The effervescent beverage will accordingly have an improved grain flavor irrespective of the malt content of the raw materials.