The present invention provides a solid preparation containing compound (I)[compound (I) is as defined in the specification] or a salt thereof, and metforminhydrochloride, which is useful as a therapeutic drug for diabetes and the like,and superior in the preservation stability. A solid preparation having a firstpart and a second part:a first part: a part containing compound (I) or a salt thereofand substantially free of metformin hydrochloride a second part: a part containingmetformin hydrochloride and substantially free of compound (I) and a salt thereof.
