Grooved noodles have three grooves formed along the noodle length direction, and the transverse cross section of the noodle length has a substantially circular main outer shape. The three grooves are positioned in the transverse cross section of the noodle length at 120° intervals in the circumferential direction, and extend in the same rotation direction relative to the center point of the transverse cross section of the noodle length. Each of the grooves has a pair of mutually facing sides that extend from the opening of the groove toward the deepest part of the groove, a first opening end on the side closer to the center point out among the pair of sides, and a second opening end on the side farther from the center point among of the pair of sides. The acute angle formed in each of the grooves by a straight line passing through the first opening end and the deepest part and a straight line passing through the first opening end and the center point is 12-28°. The area of a center region in each of the three grooves forming a triangle comprising three straight lines passing through the deepest part and the midpoint between the first opening end and the second opening end has a value of 6-34% relative to the area having the main outer shape when the three grooves are not present. The noodle length occupies 85% or more of the center region.
