The invention obtains a muffler structure for a vehicle which can suppress an emission sound. In a muffler shell for a muffler for a vehicle, there are formed a peripheral joint in which an upper shell and a lower shell corresponding to a plurality of shell structure portions are joined in respective peripheral joint flanges and, and an inter-isolation chamber joint in which the upper shell and the lower shell are joined in inter-isolation chamber joint flanges and in such a manner as to partition a space positioned in an inner side of the peripheral joint into a plurality of isolation chambers and arranged in parallel in a gas flow direction.