A method for manufacturing flavonoids, comprising: an extraction step, contacting an extraction material containing flavonoids with an extraction agent containing liquefied dimethyl ether to extract an extraction liquid containing flavonoids； and a gasification step, from the extraction liquid At least a part of the extractant is vaporized and removed to obtain an extract containing flavonoids.一種類黃酮類的製造方法，包括：萃取步驟，使含有類黃酮類的萃取料與含有液化的二甲醚的萃取劑接觸，萃取含有類黃酮類的萃取液；以及氣化步驟，從萃取液中使萃取劑的至少一部分氣化而去除，獲得含有類黃酮類的萃取物。
