It has good handleability and has excellent adhesiveness that sticks to the oral mucosa even when there is a lot of moisture and saliva on the oral mucosal surface. Provided is a novel oral mucosal patch having characteristics that enhance the protective effect and further characteristics that remain at the site of application for a long time. An oral mucosa patch having an lyophilized product containing a polymer on an adhesive surface with an oral mucosa, wherein the content of the polymer in the lyophilized product is 20% by mass or more, and the hyaluron in the polymer An oral mucosa patch having an acid content of 50% by mass or more.取扱性が良好で、口腔粘膜表面の水分や唾液が多い場合でも口腔粘膜に貼り付く優れた貼付性を備えており、貼付後に水分や唾液を含んで弾性を示すことで貼付部位を物理的に保護する効果を高める特性と、さらに、貼付部位に長時間残存する特性を備えた、新規な口腔粘膜貼付材を提供する。 口腔粘膜との接着面に、ポリマーを含む凍結乾燥体を備えた口腔粘膜貼付材であって、 前記凍結乾燥体中の前記ポリマーの含有量が、２０質量％以上であり、 前記ポリマー中のヒアルロン酸の含有量が、５０質量％以上である、口腔粘膜貼付材。
