The invention relates to a photomultiplier (10) with a fastening device, where the photomultiplier (10) has a solid cylindrical body, particularly a glass body (11), and a tubular jacket, a light inlet (12) on the front end and connecting contacts (14) on the back end, and where the fastening device has a socket (20) on the front end and a plug contact (30) resting on the connecting contacts (14) on the back end, and where a force-fitting and form-fitting connection is produced between the plug contact (30) and the socket (20) by means of a connecting component (40).