PROBLEM TO BE SOLVED: To provide a compact tablet which rapidly disintegrates in the oral cavity with hydrotalcite particles as an active ingredient.SOLUTION: A compact tablet with rapid oral disintegration properties comprises hydrotalcite with an apparent specific volume of 1.2 to 2.0 mL as a raw material, with the compact tablet having a diameter of not more than 10 mm and a thickness of not more than 6 mm, and the weight of the hydrotalcite being 88 to 100 wt.% relative to the total weight of the tablet.SELECTED DRAWING: None