A method for measuring blood glucose level, said method comprising detecting skin gas emanated from the skin of a living body and then calculating the blood glucose level of the living body on the basis of the detection value of the skin gas.本發明的血糖值測定方法係檢測從生體的皮膚排出的皮膚氣體;根據前述皮膚氣體的檢測值算出前述生體的血糖值。