PROBLEM TO BE SOLVED: To provide novel crystalline forms of a dipeptidyl peptidase-IV inhibitor.SOLUTION: The present invention provides crystalline (2R,3S,5R)-2-(2,5-Difluorophenyl)-5-[2-(methylsulfonyl)-2,6-dihydropyrrolo[3,4-c]pyrazol-5(4H)-yl]tetrahydro-2H-pyran-3-amine, represented by compound (I), which has following four peaks in a powder X-ray diffraction pattern: 17.8±0.1 2θ, 19.2±0.1 2θ, 22.2±0.1 2θ and 24.1±0.1 2θ.SELECTED DRAWING: Figure 16【課題】ジペプチジルペプチダーゼ-IV阻害剤の新規結晶形の提供。【解決手段】化合物(I)で表される結晶質(2R,3S,5R)-2-(2,5-ジフルオロフェニル)-5-[2-(メチルスルホニル)-2,6-ジヒドロピロロ[3,4-c]ピラゾール-5(4H)-イル]テトラヒドロ-2H-ピラン-3-アミン。粉末X線回折パターンにおける次の4ピーク:17.8±0.1 2θ、19.2±0.1 2θ、22.2±0.1 2θ及び24.1±0.1 2θを有する。【選択図】図16