To provide a method for forming a quality sheet and a quality film which can produce the sheet or the film in high productivity over a long time by a vacuum adhesion method.

In the method for forming the polymer sheet in which a molten polymer sheet is extruded from a nozzle, adhered to a cooling roll by the vacuum adhesion method, and solidified, the surface of the cooling roll is a micro- crack surface. In the method for forming the oriented film in which the molten polymer sheet is extruded from the nozzle, adhered to the cooling roll by the vacuum adhesion method, and solidified into an unoriented sheet, and the unoriented sheet is biaxially oriented in the longitudinal and transverse directions. the cooling roll has the micro-crack surface.