In a exhaust device for an vehicle internal combustion engine, an exhaust pipe (20) of an engine (11) branches at a branching point (B) into a downstream-side first branch pipe (32) and a downstream-side second branch pipe (33). A first silencer (36) is attached to the first branch pipe (32), and a second silencer (37) is attached to the second branch pipe (33). The first branch pipe (32) and the second branch pipe (33) are different in at least one of bending rigidity and mass so that when the first branch pipe (32) and the second branch pipe (33) are vibrated in a specific vibration frequency range, vibrations of the two branch pipes (32, 33) cancel out each other at the branching point (B).