A motorcycle 10 has an air cleaner unit 40 having a casing body 52 formed from carbon fibre and configured to introduce outside air into an engine 12. A region of at least a portion of the air cleaner unit 40 is formed from a lamination layer part 120 form...

The present invention has an object of providing the carbon fiber (or the nonwoven fabric configured of the aforementioned carbon fiber) of which the surface area, the graphitization degree, and the fiber diameter are large, high, and small, respectively, ...