PROBLEM TO BE SOLVED: To provide a mucin production inhibitor that has excellent effects in expectoration promotion, asthma symptom alleviation and aspiration pneumonia prevention in a respiratory epithelial tissue.SOLUTION: An inhibitor for mucin production in a respiratory epithelial tissue is obtained by the extraction treatment of Allium fistulosum L. with water, hydrous organic solvent or organic solvent. There are also provided a functional food and a food additive containing the mucin production inhibitor as an active ingredient.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】気道上皮組織において、去痰の促進、喘息症状緩和ならびに誤嚥性肺炎予防に優れた効果を有するムチン産生抑制剤を提供する。【解決手段】ネギ(Allium fistulosum L.)を水、含水有機溶媒もしくは有機溶媒で抽出することにより得られる気道上皮組織におけるムチン産生抑制剤。ムチン産生抑制剤を有効成分として含有する機能性食品及び食品添加物。【選択図】なし