A controlled release composition showing release of an active ingredient controlled in two or more steps at different release rates, which comprises 1) a release-controlled part A, which is a sustained-release matrix comprising a proton pump inhibitor as an active ingredient and a hydrophilic polymer, which is capable of controlling release of the active ingredient to occur at a predetermined rate; and 2) a release-controlled part B, which is a sustained-release matrix comprising a proton pump inhibitor as an active ingredient and a hydrophilic polymer, which is capable of controlling release of the active ingredient to occur at a predetermined rate lower than the release rate of the release-controlled part A; wherein (i) the proton pump inhibitors contained in the release-controlled parts A and B are the same or different and each is a compound represented by the following formula (Ia): wherein ring A is a benzene ring, R 1 is a C 1-3 alkyl group, R 2 is an optionally halogenated C 1-3 alkoxy group, R 3 is a hydrogen atom and R 4 is a hydrogen atom or an optionally halogenated C 1-3 alkoxy group, or a salt thereof or an optically active form thereof, (ii) the release-controlled part A is coated with the release-controlled part B, and (iii) the release of the active ingredient from the release-controlled part B precedes the release of the active ingredient from the release-controlled part A. 1) a release-controlled part A, which is a sustained-release matrix comprising a proton pump inhibitor as an active ingredient and a hydrophilic polymer, which is capable of controlling release of the active ingredient to occur at a predetermined rate; and 2) a release-controlled part B, which is a sustained-release matrix comprising a proton pump inhibitor as an active ingredient and a hydrophilic polymer, which is capable of controlling release of the active ingredient to occur at a predetermined rate lower than the release rate of the release-controlled part A; wherein (i) the proton pump inhibitors contained in the release-controlled parts A and B are the same or different and each is a compound represented by the following formula (Ia): wherein ring A is a benzene ring, R 1 is a C 1-3 alkyl group, R 2 is an optionally halogenated C 1-3 alkoxy group, R 3 is a hydrogen atom and R 4 is a hydrogen atom or an optionally halogenated C 1-3 alkoxy group, or a salt thereof or an optically active form thereof, (ii) the release-controlled part A is coated with the release-controlled part B, and (iii) the release of the active ingredient from the release-controlled part B precedes the release of the active ingredient from the release-controlled part A. (i) the proton pump inhibitors contained in the release-controlled parts A and B are the same or different and each is a compound represented by the following formula (Ia): wherein ring A is a benzene ring, R 1 is a C 1-3 alkyl group, R 2 is an optionally halogenated C 1-3 alkoxy group, R 3 is a hydrogen atom and R 4 is a hydrogen atom or an optionally halogenated C 1-3 alkoxy group, or a salt thereof or an optically active form thereof, (ii) the release-controlled part A is coated with the release-controlled part B, and (iii) the release of the active ingredient from the release-controlled part B precedes the release of the active ingredient from the release-controlled part A.