The present invention provides a template for obtaining a valve leaflet material for forming a valve leaflet that distributes stress applied thereto so that the valv leaflet can have increased tolerance. A template (13) having a valve leaflet base forming part (11) shaped corresponding to a valve leaflet base further has a wing forming part (15) located outside the valve leaflet base forming part (11) and corresponding to a wing portion. The wing forming part (15) has one or more holes located in an area corresponding to the contour of the wing portion or has a guide part located in the area corresponding to the contour of the wing portion.
