A metal gasket (2) in which an optimal tightening surface pressure distribution can be easily obtained at the initial stage of assembly and the optimal tightening surface pressure distribution can be stably maintained even after long term use. The metal gasket (2) has a substantially flat plate-like body (4) provided with an opening (6) and also has a grommet portion (8) having a turned down portion (8a) formed by turning down a thin plate to surround the opening (6). A thin plate continuous from the turned down portion (8a) overlaps the body (4) to form a flange portion (8b) at the grommet portion (8), and the width of the flange portion (8b) is not constant in the entire grommet portion (8).