The grooved noodles have three main grooves formed along the direction of noodle strings and a main outer shape of which the cross section of the noodle bands is substantially circular, and the three grooves have noodles in the cross section of noodle strips And are arranged at 120 degree inter in the circumferential direction of the line and extend in the same rotation direction with respect to the center point of the transverse cross section of the noodle band, and the respective grooves are opposed to each other and extend from the opening of the groove to the deepest portion A first opening end portion in a side close to a center point among a pair of sides and a second opening end portion in a side far from a center point among a pair of sides, An acute angle formed by a straight line passing through the first opening end portion and the deepest portion in each groove and a straight line passing through the first opening end portion and the center point is 12 to 28 degrees and each of the three grooves A triangle composed of three straight lines passing through the midpoint and the deepest portion of the first opening end portion and the second opening end portion In the area of the central region to be formed has a e of 6-34% relative to the area of the main outline of the case of that there is no three grooves, noodle strings occupy more than 85% of the center region.溝付き麺は、麺線方向に沿って形成された3本の溝を有すると共に麺線の横断面がほぼ円形の主外形を有し、3本の溝は、麺線の横断面において、麺線の周方向に120度間隔で配置されると共に麺線の横断面の中心点に対して同じ回転方向に延在し、それぞれの溝は、互いに対向し且つ溝の開口部から溝の最深部に向かって延びる一対の辺と、一対の辺のうち中心点に近い辺における第1の開口端部と、一対の辺のうち中心点から遠い辺における第2の開口端部とを有し、それぞれの溝における第1の開口端部および最深部を通る直線と第1の開口端部および中心点を通る直線により形成される鋭角の角度が12~28度であり、3本の溝のそれぞれの第1の開口端部および第2の開口端部の中点と最深部とを通る3本の直線から成る三角形で形成される中心領域の面積が、3本の溝がないものとした場合の主外形の面積に対して6~34%の値を有し、中心領域の85%以上を麺線が占める。
