Abstract: An object of the present invention is to provide an in-vessel fermentation type sparkling sake obtained by allowing mixed sake, which is prepared by mixing sake obtained by squeezing with turbid sake obtained by roughly filtering sake mash containing yeast and having fermentation activity, to generate carbon dioxide gas in a hermetically sealed vessel, wherein the sparkling sake generates fine bubbles like those from champagne, is palatable, is less turbid, and has a refreshing flavor, and to provide a method for producing the same. Disclosed is sparkling sake characterized in that the sparkling sake is prepared by using rice and rice koji as raw materials; carbon dioxide gas present in the vessel is the carbon dioxide gas substantially generated by secondary fermentation; and the content of the carbon dioxide gas is 3.0 GV or more.