The present invention provides oral preparations with good disintegration containing a slightly water-soluble active ingredient, which comprise a mixture of a solid formed product (e.g. a granule) and a second disintegrant wherein said solid formed product comprises a slightly water-soluble active ingredient, a first disintegrant and a water-soluble excipient which is formed by using a water-soluble polymer binder; or comprises a solid formed product prepared from a slightly water-soluble active ingredient, a disintegrant and a sugar alcohol by using a water-soluble polymer binder. When orally administered, these oral preparations exhibit excellent dissolution characteristics of the active ingredient in the digestive tract, and further, these preparations can show equivalent dissolution profile even at different amounts of the active ingredient, and thus enable the selection of the most suitable medicament for each patient, which makes these preparations highly useful in the clinical field.