Nowadays, in the process of building a sustainable society, use of thermosetting resins derived from fossil resources raises an environmental impact problem in the field of composite materials, because of difficulty in recycle.The thermosetting resin is often used as a matrix of artificial fibers, such as glass and carbon, and generally used as GFRP and CFRP.These materials have superior mechanical properties, while their disposal is difficult, as mentioned above.Thus, a natural resource material, called "green composites" attracts considerable attention.