[PROBLEM TO BE SOLVED] To provide a compound or a pharmaceutically acceptable salt thereof, having excellent hypoglycemic action, protective action of β cells or pancreatic, and a pharmaceutical composition with curative effect and/ or preventive effect for elevation of glycaemia caused by disorder of carbohydrate metabolism of Type 1 Diabetes Mellitus, Type 2 Diabetes Mellitus. [SOLUTION] A compound or a pharmaceutically acceptable salt thereof, represented by the general formula (I).提供具有優良之血糖降低作用、β細胞或胰臟保護作用的化合物或其藥學上可容許之鹽,以及對於因糖代謝異常而引起血糖上升之1型糖尿病、2型糖尿病等具有優良治療效果及/或預防效果的醫藥組成物。[解決手段]通式(I):所示之化合物或其之藥學上可容許之鹽。