The present invention relates to an orally disintegrating tablet containing (1) an active ingredient, (2) mannitol, (3) crystalline cellulose and (4) at least two kinds of particular ingredients selected from the group consisting of low-substituted hydroxypropylcellulose, cornstarch and carmellose, wherein the blending ratio of each ingredient relative to 100 wt% of the disintegrating tablet is (1) 0.01 to 50 wt%, (2) 20 to 86 wt%, (3) 10 to 30 wt%, and (4) 1 to 20 wt% for each particular ingredient and 3 to 60 wt% as the total of the particular ingredients to be blended, and an assembly of (3) crystalline cellulose to be blended has a bulk density of not more than 0.18 g/cm3, and can provide an orally disintegrating tablet having both suitable hardness and rapid disintegrability in oral cavity, which maintains orally disintegrability even under moist conditions, and hardness of not less than a predetermined level necessary for using in an automatic packaging machine.
