Disclosed is a quickly soluble oral film dosage formasking a nasty taste, in particular, a quickly soluble oralfilm dosage comprising a stevioside based sweetener and ahigh potency sweetener in a ratio by weight (w/w) of 1:3 to3:1, which may efficiently mask a bitter or nasty taste of amedicine and may be quickly dissolved in a mouth withoutwater, thereby improving an aftertaste thereof thusenhancing dosage acceptability of a patient.