PROBLEM TO BE SOLVED: To provide a koji which contains an aroma component produced at the time of roasting treatment of grain and the like, and which presents roasting aroma; to provide foods and drinks presenting the roasting aroma used the koji as a raw material, and to provide a production method thereof.SOLUTION: Koji is produced by gelatinization of a raw material, such as grain or the like, subsequently roasting, and then allowing the implantation of aspergillus conidia at the time of absorbing the raw material and plumping. Using the koji as a raw material enables the production of brewed materials, such as sake, drinks and foods which present roasting aroma.SELECTED DRAWING: Figure 1【課題】 穀物等の焙煎処理時に生成される香気成分を含み香ばしい香りを呈した麹と、この麹を原料とした香ばしい香りを呈した飲食品及びその製造方法を提供する。【解決手段】 穀物等の原料をα化したのちに焙煎処理し、その原料を吸水・膨化する際に麹菌分生子を着床させ製麹する。また、この麹を原料として用いることにより、香ばしい香りを呈した清酒等の醸造物や飲料、食品の製造が可能となる。【選択図】図1