A novel orally disintegrating tablet additive for imparting rapid disintegration and tablet hardness to an orally disintegrating tablet and a method for producing the same are provided. The additive for orally disintegrating tablets according to one embodiment of the present invention is D-mannitol, low substituted hydroxypropyl cellulose (however, the average particle diameter is 20 μm or less and the degree of substitution of hydroxypropoxy group is 11%, average particle diameter Is 45 μm or less, the degree of substitution of hydroxypropoxy group is 14%, and the average particle size is 45 μm or less, the degree of substitution of hydroxypropoxy group is 11% and 90% cumulative particle size is 100 μm or less, except for crospovidone and crystals It is characterized in that it contains cellulose and contains the low-substituted hydroxypropyl cellulose and the crospovidone in a ratio of 5: 4.口腔内崩壊錠に速やかな崩壊性と錠剤硬度を付与する新規な口腔内崩壊錠用添加剤及びその製造方法を提供する。本発明に一実施形態に係る口腔内崩壊錠用添加剤は、Ｄ－マンニトール、低置換度ヒドロキシプロピルセルロース（ただし、平均粒子径が２０μｍ以下且つヒドロキシプロポキシ基の置換度が１１％、平均粒子径が４５μｍ以下且つヒドロキシプロポキシ基の置換度が１４％、及び平均粒子径が４５μｍ以下且つヒドロキシプロポキシ基の置換度が１１％且つ９０％積算粒子径が１００μｍ以下のものを除く）、クロスポビドン及び結晶セルロースを含み、前記低置換度ヒドロキシプロピルセルロースと前記クロスポビドンとを５：４の割合で含むこと、を特徴とする。
