There is provided a pellicle having a frame, a membrane and an agglutinant layer (adhesive to bond the pellicle on a photo mask) in which the release liner (detachable sheet) laid to the agglutinant layer for protection thereof is controlled to have a surface roughness of 5 - 30 micrometers on the side of the liner which is attached to the agglutinant layer, with a result that the releasability of the liner is improved suitably.