Steam and air are allowed to spread over the entire circumference of the drum, and the steam and air are allowed to sufficiently contact the raw material, thereby improving the efficiency of raw material treatment. The apparatus for producing malted rice includes a cylindrical drum 10 in which a raw material W of grain is put and which is rotatably supported so that its axis is approximately horizontal and which is rotated by a rotation drive part 30, a casing 40 for housing the drum 10, and a steam air supply part 50 for injecting steam and/or air into the drum 10 and supplying the steam and air, The steam air supply part 50 is formed in a tubular shape whose axis is aligned with the axis of the drum, and many small holes 17 communicating the inside and outside of the drum 10 are formed in a matrix shape...

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