A window panel for a display device includes a window substrate which includes a transmissive area which transmits an image displayed on a display panel and a non-transmissive area disposed at a periphery of the transmissive area, a first print layer disposed on a first side of the window substrate in the non-transmissive area, and which forms a boundary line between the transmissive area and the non-transmissive area, and a second print layer disposed on the first print layer in the non-transmissive area. The non-transmissive area includes a first non-transmissive area adjacent to the transmissive area and a second non-transmissive area adjacent to an edge of the window substrate, and side surfaces of the first and second print layers form an inclined surface which has an inclination angle that is smaller than a right angle with respect to the first side of the window substrate in the first non-transmissive area.