PROBLEM TO BE SOLVED: To provide a mixture forming device which can automatically perform a process where a liquid mixture is formed by mixing heated liquid and a mixture ingredient and is cooled until its temperature becomes suitable, and to provide a method of forming the mixture.SOLUTION: A mixture forming device comprises: a heater (4) which heats supplied liquid (L) a first heat exchanger (3) which exchanges heat of the liquid (L) heated by the heater (4) a milk formula preparation part (5) which forms milk (M) by mixing powdered milk and the liquid (L) heat-exchanged by the first heat exchanger (3) and a second heat exchanger (60) which exchanges heat of the milk formed by the milk formula preparation part (5).COPYRIGHT: (C)2015,JPO&INPIT【課題】加熱された液体と混合物用原料とを混合して液体混合物を生成し、かつ該液体混合物を適温にまで冷却する工程を自動的に行い得る混合物生成装置及び混合物生成方法を提供する。【解決手段】供給される液体(L)を加熱するヒーター(4)と、ヒーター(4)にて加熱された液体(L)を熱交換する第1の熱交換器(3)と、粉ミルクと第1の熱交換器(3)にて熱交換された液体(L)とを混合してミルク(M)を生成する調乳部(5)と、調乳部(5)にて生成されたミルクを熱交換する第2の熱交換器(60)とが設けられている。【選択図】図1