The present invention provides a small-sized preparation that is easy to take, containing 26% or more of nateglinide and 28% or more of at least one disintegrant selected from the group consisting of carmellose or salts thereof, sodium carboxymethyl starch, croscarmellose sodium, crospovidone, partly pregelatinized starch and low-substituted hydroxypropyl cellulose, based on the total mass of the preparation. The preparation of the present invention has high contents of nateglinide, which can be absorbed immediately to exhibit a hypoglycemic action.