PURPOSE: To obtain a rubber composition having high extension and good processability, contributing to the recycling of a fiber-reinforced plastic(FRP) and exhibiting increased hardness by compounding a rubber raw material with a specific amount of a crushed product (FRP powder).

CONSTITUTION: This composition giving a vulcanized rubber having a hardness of ≥70 (JIS A) is produced by compounding 100 pts.wt. of a rubber raw material with ≤200 pts.wt. (preferably 5-100 pts.wt.) of crushed FRP having an average particle diameter of ≤2mm, preferably ≤100μm.