PROBLEM TO BE SOLVED: To provide a tablet in which side effects in stomach are alleviated, and which has excellent in vivo disintegratability.SOLUTION: The invention relates to a tablet and production method thereof, the tablet comprising a layer (&alpha) containing a mixture of a particle group containing a non-steroid based poorly water-soluble drug (A), and a particle group of at least one kind (B) selected from the group consisting of sodium carbonate, magnesium carbonate, potassium carbonate, sodium bicarbonate, magnesium hydrogencarbonate, and potassium hydrogencarbonate a layer (&bgr) containing at least one kind (C) selected from the group consisting of aluminum based antacid and magnesium based antacid except the component (B). The mass ratio represented by the component (B)/component (A) in the layer (&alpha) is 0.15 or more.SELECTED DRAWING: None