In a raw material preparing step, a rice powder as a primary raw material powder is added with a water to prepare a mixed raw material. In a kneading step, the mixed raw material is kneaded to form a kneaded substance. In a pressing/extending step, the kneaded substance is pressed and extended to form noodle dough sheet. In a slitting step, the noodle dough sheet is slit into predetermined noodle strand shape to obtain a continuous noodle strand However, these steps maintain a non-alpha state of the rice powder component In a packaging step, a unit-length noodle strand is accommodated in a pouch-like heat-resistant packaging container and hermetically sealed to obtain a packaged unit-length noodle strand, while maintaining a non-alpha state of the rice powder component in the noodle strand.
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