PROBLEM TO BE SOLVED: To provide a solid preparation which is useful as a therapeutic drug for diabetes and the like and superior in preservation stability, the solid preparation comprising a compound (I) (defined in the specification) or a salt thereof, and metformin hydrochloride.SOLUTION: Disclosed herein is a solid preparation comprising the following first part and second part. The first part is a part comprising a compound (I) or a salt thereof and substantially free of metformin hydrochloride. The second part is a part comprising metformin hydrochloride and substantially free of the compound (I) and a salt thereof.【課題】糖尿病治療薬などとして有用であり、保存安定性に優れた、化合物（Ｉ）［化合物（Ｉ）の定義は明細書のとおり］またはその塩と塩酸メトホルミンを含む固形製剤の提供。【解決手段】第１の部分：化合物（Ｉ）またはその塩を含有し、かつ塩酸メトホルミンを実質的に含有しない部分；および第２の部分：塩酸メトホルミンを含有し、かつ化合物（Ｉ）またはその塩を実質的に含有しない部分を含有する、固形製剤。【選択図】なし
