PROBLEM TO BE SOLVED: To obtain a steel cord good in penetration of a rubber into the inside thereof, capable of increasing the stiffness crossing to the tire rotation direction while decreasing the stiffness of the tire in the rotation direction, good in fatigue resistance to the compression and bending, and excellent in producing and handling workability. SOLUTION: This steel cord for tire reinforcement has a core strand 1 having nearly spiral kink having a kink pitch P1 and a kink outside diameter D1 in the miner axis direction of the cord, satisfying the equations P1=(0.1P to 0.5P), and (T-D1)/2d=(0.05 to 0.70). The core strand 1 appears between side strands 2 positioned in both sides and arranged so as to put the major axis of a nearly oval shape therebetween, nearly at the interval of pitch P1. A flat rate of the nearly oval shape (percentage of T/W) is 38-60%.
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