A tablet comprising a particle group (A) containing a particle group of a poorly water-soluble drug and at least one particle group (B) selected from a particle group of carbonate and a particle group of bicarbonate.水難溶性薬物の粒子群を含有する粒子群(A)と、炭酸塩の粒子群及び炭酸水素塩の粒子群から選択される少なくとも1種の粒子群(B)と、を含む錠剤。