To provide rear step structure capable of preventing interference of a muffler or a downstream part of an exhaust pipe with a bracket for supporting a rear step.

The muffler 6 is arranged on one side of the center line C of a car body B over a rear wheel 3, and the bracket 7 for supporting the rear step 8 is arranged close to the muffler 6 or the downstream part 61a of the exhaust pipe connected to an inlet 60 of the muffler 6. The bracket 7 is bent to be projected outside, and formed into a shape passing outside the muffler 6 or the downstream part 61a of the exhaust pipe.