The present invention relates to a prefabricated arch element (1) for building an arched vault (11), comprising two girder elements (2) and arch-shaped masonry (3), which is laid between these girder elements (2). In addition, the present invention relates to a vault (11) which is built using such prefabricated arch elements (1), a method for producing such a prefabricated arch element (1), a method for building such a vault (11) and a device for producing such a prefabricated arch element (1).