Improvements to operating drapes with a window

The present invention relates to a drape for an operation formed of an impermeable web which has a window (3) for access to an operation part. Adhesives which enable separation of these sheets that a sheet of these two sheets twists for tearing off by a web consisting of an impermeable sheet (10, 20) of two sheets, as for this drape, It is held along a mutual rim at one so that it may stick, and a window (3) is shared between sheets of these two sheets. Especially the present invention is applied to a drape for an operation used for a surgical operation.