And 55 to 75 mass%, the present invention, the average particle crystalline cellulose 0.30~0.50g / cm 3, an angle of repose of 40 degrees or less [A] is the bulk density 80~150μm, average particle size loose and 17.5 to 37.5 mass%, and 0.01 fluidizing agent [C] water-soluble cellulose derivatives diameter 80μm or less, a viscosity of 20 ℃ solution of 2 wt% is 10mPa · s or less [B] and 0.5 wt%, and wherein the 5 to 20% by weight and, and the excipient average particle size of 150μm or less, and 0.60~1.00g / cm 3 bulk density of the loose [D] said [B] content ratio ([D] / [B]) is less than 1.0 and [D], wherein [A], [B], [C], and all the powder [D] includes state, and an average particle diameter of 100μm or less, to provide a cellulose composition bulk density of 0.47g / cm 3 or more, a repose angle of 35 degrees or less, tapped bulk density of 0.60g / cm 3 or more loose .本発明は、平均粒子径が80~150μm、ゆるみ嵩密度が0.30~0.50g/cm3、安息角が40度以下である結晶セルロース[A]を55~75質量%と、平均粒子径が80μm以下、2質量%の20℃水溶液の粘度が10mPa・s以下である水溶性セルロース誘導体[B]を17.5~37.5質量%と、流動化剤[C]を0.01~0.5質量%と、及び平均粒子径が150μm以下、ゆるみ嵩密度が0.60~1.00g/cm3である賦形剤[D]を5~20質量%と、を含み、前記[D]と前記[B]の含有比([D]/[B])が1.0未満であり、前記[A]、[B]、[C]、及び[D]を全て粉体の状態で含み、並びに平均粒子径が100μm以下、ゆるみ嵩密度が0.47g/cm3以上、安息角が35度以下、タッピング嵩密度が0.60g/cm3以上であるセルロース組成物を提供する。
