PURPOSE: A non-shield data cable for external electromagnetic wave interference prevention is provided to improve strength and hardness by including space protrusions which are arranged at constant intervals. CONSTITUTION: A jacket(30) surrounds combination pairs(10) and accomplishes an outer tube. The combination pairs are separated by a partition wall(22). The thickness of the partition wall is 0.3 to 0.7mm. The length of the partition wall is 4.0 to 4.5mm. A space protrusion(42) separates combination pairs as a straight line shape according to a longitudinal direction from outside. An air groove(44) forms an air layer between the combination pairs. The space protrusion and air groove are formed at regular intervals. The combination pair is composed of an insulator and a conductive wire which transfers voice or image signal.
