PROBLEM TO BE SOLVED: To provide technical means for producing a tablet containing irbesartan with highly improved chemical stability when stored under a high-temperature and high-humidity environment.SOLUTION: There is provided a tablet containing irbesartan in which content of disintegrant in an uncoated tablet portion is within a range of 4.5 to 15.0 wt.% with respect to the total weight of an uncoated tablet, and disintegrant is selected from carmellose, carmellose calcium, croscarmellose sodium, crospovidone and the like. It is desirable that the tablet is a film-coated tablet.SELECTED DRAWING: None