A grooved noodle comprises: a core located at a center position of a noodle in cross section and having a circular shape with a diameter being 26% to 41% of a diameter of the noodle; and hook-shaped portions formed on a periphery of the core due to existences of grooves each extending spirally from the periphery of the core to a surface of the noodle, each hook-shaped portion having a leg with a width in a range of 18% to 30% of the diameter of the noodle and a blade extending from an outer end of the leg, an outer periphery of the blade extending along an arc from its base connected to the leg to its tip, the base being located further inwardly toward the center of the noodle than the tip.
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