A hybrid cord (1) as a rubber reinforcing cord having excellent dimensional stability and flexible performance and a rubber product reinforced with the hybrid cord, comprising glass fiber strands (2) at the center thereof and aramid fiber strands (3) around the glass fiber strands, wherein a plurality of strands of RFL treated glass fiber filaments are first twisted and a plurality of RFL treated aramid fiber filaments are bound into several strands and the strands are first twisted, the glass fiber strands (2) are disposed at the center and the aramid fiber strands (3) around the glass fiber strands are finally twisted in the direction reverse to the direction of the first twisting, and a rubber coating is formed on the fiber strands by an overcoat treatment.