A fiber composite material, including: an elastomer; carbon nanofibers
having an average diameter of 0.7 to 15 nm and an average length of 0.5
to 100 micrometers; and fibers having an average diameter of 1 to 100
micrometers and an aspect ratio of 50 to 500, the carbon nanofibers and
the fibers being dispersed in the elastomer, and the elastomer including
an unsaturated bond or a group exhibiting affinity to the carbon
nanofibers.