Golf swing training device having constant resistive and rewind forces throughout the swings. The present invention is a process for producing an edible oil, wherein when the edible oil is expressed from an oil-containing raw material, a diacylglycerol-containing oil or fat is added to the oil-containing raw material so that the diacylglycerol content in the oil or fat obtained after the oil expression is 4% by weight or more. The fiber webs may also exhibit a low thickness.