To improve temperature rising performance of a manifold catalyser in an exhaust manifold for a four-cylinder engine by preventing exhaust interference and shortening the total length of an exhaust-pipe.

Branches B1, B4 of No.1, No.4 outer cylinders discontinuous in the ignition order join together at a confluent angle θ1=20° or less. Branches B2, B3 of No.2, No.3 inner cylinders discontinuous in the ignition order are transverse-shape, and join together at the shortest and at a confluent angle θ2=20° or less. Respective unification branches W1, W2 join at a collecting part DF in parallel or at a confluent angle of 20° or less.