Friction transmission belt, cord for same, and manufacturing method for same

A V-ribbed belt comprising:

• a compression rubber layer formed of a rubber composition containing a rubber component comprising an ethylene-α-olefin elastomer;
• and
• a core wire, and
• having a tensile elastic modulus of 240 to 500 N/(mm·%),
• wherein:
• the tensile elastic modulus of the V-ribbed belt is expressed as an amount of force required to stretch a belt of 1 mm width by 1% length,
• the core wire comprises:
• a core yarn comprising a high-elastic modulus fiber having a tensile elastic modulus of 200 to 900 GPa;
• and
• a plurality of sheath yarns each comprising a low-elastic modulus fiber having a tensile elastic modulus of 50 to 150 GPa and disposed around the core yarn,
• the plurality of sheath yarns are twisted together around the core yarn, and wherein the core wire has a ratio of an average diameter of the sheath yarns to an average diameter of the core yarn of 0.2 to 0.4,
• each of the sheath yarns is twisted in a same direction as a direction in which the twisted sheath yarns are further twisted with the core yarn,
• a total fineness of the core yarn is 200 to 600 tex, and
• the sheath yarns have the average diameter of 0.13 to 0.25 mm.