A diaphragm valve (1) having a diaphragm (3) that is clamped between two housing parts (9, 10), and wherein by way of the diaphragm (3), a valve seat (6) can be opened and closed. At least one clamping region (23) is formed radially outside of a clamping region (8), which clamping region (23) protrudes from the clamping region (8), and on the end face of which a sealing surface (11, 12) is formed.