A motorcycle has a frame and a power unit. The frame comprises a main
frame member extending rearward from a steering head pipe. The power unit
comprises a drive source, power transmission devices attached to the
output end of the drive source, and a casing that houses the power
transmission devices and that is suspended from the main frame member.
The casing of the power unit comprises a recess opening toward the main
frame member. A boss is formed on the bottom of the recess and is
suspended from the main frame member.