V-belt and production method therefor

A V-belt comprising

• a rubber composition forming a portion to be V-shaped side faces of the V-belt, wherein
• the rubber composition includes nanofibers and organic short fibers oriented along a belt width of the V-belt, the nanofibers including polyethylene terephthalate (PET) fibers having a fiber diameter ranging from 300 nm to 900 nm, and the organic short fibers having a fiber diameter of 10 μm or larger, and
• in the rubber composition, a ratio of a storage modulus in a grain direction along the belt width to a storage modulus in a cross-grain direction along a belt length of the V-belt is 5 or greater, the storage modulus in the grain direction being measured based on JIS K6394 with the rubber composition stretched at a mean strain which is a strain under a load 1.3 times greater than a load at a strain of 1%, a strain amplitude of 0.1%, a frequency of 10 Hz, and a test temperature of 100° C., and the storage modulus in the cross-grain direction being measured based on JIS K6394 with the rubber composition stretched at the mean strain of 5%, the strain amplitude of 1%, the frequency of 10 Hz, and the test temperature of 100° C.