The present invention relates to a cellulose powder usable for a satisfactory orally disintegrating tablet having excellent compression moldability and well-balanced tablet moldability and disintegration properties, which can obtain excellent ingestion feel without feeling roughness and dryness in the oral cavity, and more particularly to a cellulose powder with an average polymerization degree of 150 to 450, an average particle diameter of not less than 10 µm but less than 100 µm, and a primary particle ratio of 50% or more.本發明係關於一種能夠用於如下口腔內崩解錠之纖維素粉末，該口腔內崩解錠係壓縮成形性優異、且取得錠劑之成形性與崩解性之平衡者，且係如於口腔內不會感到粗澀或乾澀而可獲得良好之服用感之令人滿意者；更詳細而言，關於一種平均聚合度為150~450、平均粒徑為10μm以上且未達100μm、一次粒子率為50%以上之纖維素粉末。
