To provide an adhesive original sheet which enables precise detection of a temporary adhesion area to which an adhesive sheet is temporarily adhered and a non-temporary adhesion area to which no adhesive sheet is temporarily adhered in a release sheet, a method for producing an adhesive original sheet, and a method for detecting an adhesive sheet.

In an adhesive original sheet 1, a plurality of adhesive sheets S1 are temporarily adhered to one surface of a belt-like release sheet RL at predetermined intervals via adhesive layers AD. The adhesive sheet S1 includes a base material sheet BS and the adhesive layer AD provided on one surface of the base material sheet. Contrast enhancement treatment that enhances the contrast between the temporary adhesion area 2 to which the adhesive sheet S1 is temporarily adhered and the non-temporary adhesion area 3 to which no adhesive sheet is temporalrily adhered is applied to the release sheet RL.