To provide a production method of a rapidly disintegrating tablet, the method that has versatility and, without a specialized device, can efficiently produce rapidly disintegrating tablets having a desired rapid disintegration property and sufficient strength. And also to provide such rapidly disintegrating tablets produced by the method, the tablets that can be easily swallowed by people such as the elderly, children and patients having a poor swallowing capability and that have sufficient strength, so that they can endure breakage and abrasion in processes such as distribution and storage and dispensing processes by tablet packing machines. The method of such rapidly disintegrating tablet includes: (1) mixing an active ingredient, an acrylic copolymer and at least a pharmaceutically acceptable additive to obtain a mixture thereof (2) tableting the mixture to obtain a compact, and (3) isothermally heating the compact at a temperature of 50.degree. C. to 100.degree. C. for a given period of time. And also to provide such rapidly disintegrating tablets produced by the production method of a rapidly disintegrating tablet.