The present invention provides a solid preparation containing compound (I) [compound (I) is as defined in the specification] or a salt thereof, and metformin hydrochloride, which is useful as a therapeutic drug for diabetes and the like, and superior in the preservation stability. A solid preparation having a first part and a second part: a first part: a part containing compound (I) or a salt thereof and substantially free of metformin hydrochloride a second part: a part containing metformin hydrochloride and substantially free of compound (I) and a salt thereof.本發明提供含有化合物(I)[化合物(I)如說明書中所界定]或其鹽，及鹽酸二甲雙胍之固態製劑，其係作為糖尿病等之治療藥物用，且具有優越貯藏安定性。此固態製劑具有第一部分及第二部分：第一部分：含有化合物(I)或其鹽且實質上不含鹽酸二甲雙胍之部分；第二部分：含有鹽酸二甲雙胍且實質上不含化合物(I)與其鹽之部分。
