Regarding fresh and boiled noodles, according to the "Fair Competition Codes concerning labeling of fresh noodles," "under these codes, 'udon noodles' refer to noodles produced after adding water to wheat flour and kneading the mixture, or to those that have been processed after the noodles are made, regardless of whether they are named hiramen (flat noodles), hiyamugi, somen or others."
生麺・茹で麺等については『生めん類の表示に関する公正競争規約』にて、『この規約で「うどん」とはひらめん、ひやむぎ、そうめんその他名称のいかんを問わず小麦粉に水を加え練り上げた後製麺したもの、又は製麺した後加工したものをいう』となっている。