A polarizing plate of the present invention comprises: main four sides which form a quadrangle or a substantially quadrangular shape, wherein the quadrangle or the substantially quadrangular shape is a non-rectangular shape having four interior angles each of which is in the range of 80° to 100°, provided that at least two of the four interior angles are not 90°, the non-rectangular polarizing plate has an in-plane absorption axis, a largest rectangle having four sides in directions parallel and perpendicular to the absorption axis of the polarizing plate can be drawn as a hypothetical rectangle in the plane of the non-rectangular polarizing plate, the hypothetical rectangle has a side which is closest to the non-rectangular shape and makes angles in the range of 0° to 5° with the non-rectangular shape, and at least one of the angles is an acute angle in the range of 1° to 5°. The polarizing plate can smoothly undergo reworking even when it has a reduced thickness.