The present invention relates to an adhesive sheet, a manufacturing method thereof, an optical filter and a plasma display panel. The present invention provides an adhesive sheet having an excellent base adhesion property through a hydroxyl group applied to a base film and an isocyanate-based compound contained in an adhesive layer through a corona processing. Accordingly, the present invention provides an adhesive sheet having an excellent base adhesion property and improved high temperature stability by using a carboxyl group-containing acryl-based copolymer having a high glass transition temperature. Further, the adhesive sheet of the present invention contains a siloxane-based compound if needed, thus preventing an initial peeling force from being increased. Accordingly, the present invention provides an adhesive sheet with an excellent base adhesion property, high temperature stability, adhesive property and reworkability to glass, and provides a manufacturing method thereof, an optical filter containing the same and a plasma display panel.