An object of the invention is to provide a mucoadhesive oral preparation having high drug absorption rate and rapid drug release rate. The means for solving the problem is a mucoadhesive oral preparation having (a) a basal layer substantially consisting of a water-insoluble material, (b) a drug layer locating above the basal layer and containing a drug but not containing mucoadhesive material, and (c) an adhesive portion locating on a portion of the surface of the drug layer side of the oral formulation and containing mucoadhesive material.