A body frame has a head pipe supporting a steering shaft, a main frame extended rearward of a vehicle body from the head pipe, and a down frame extended downward of the vehicle body from the head pipe, wherein the down frame includes a front down frame member forming at least a front portion of the down frame, and a rear down frame member forming at least part of a rear portion of the down frame, which are joined. The rear down frame member integrally has an arm supporting the main frame and a gusset reinforcing a joined portion of the main frame to the head pipe.