An exhaust manifold includes a plurality of branch pipes 2 to 5 and an adapter member 9 that has a ring portion 10 provided at exhaust-gas downstream side end portions 2a to 5a of the branch pipes 2 to 5 and with a reinforcement portion 11. The adapter member 9 and the exhaust-gas downstream side end portions 2a to 5a, which are inserted into the adapter member 9, are fixed with each other by a circular weld line X1 formed along outer circumferences of the exhaust-gas downstream side end portions 2a to 5a of the branch pipes 2 to 5 and also by a weld line X2 formed along the adjacent side wall portions 2b to 5b of the branch pipes 2 to 5.