An engine unit is supported by a body frame, and a front body portion is covered
with a cowling. This cowling is made wider than the body frame to form a space
in the vehicle widthwise direction between the body frame and cowling, and an air,
cleaner unit is accommodated in this space. The air cleaner unit has a substantially
flat filter, a filter support portion, and a filter insertion hole. The attachment
direction of the filter is set in its longitudinal direction, and the filter insertion
hole is formed in a position corresponding to the end face of the filter when it
is attached. The filter, the filter support portion, and air cleaner lid member
divide the air cleaner main body into a clean chamber and dirty chamber.
