NOVELTY - Carbon nanotube twisted-yarn has breaking-load index (F) of 150 nN or more in state in which twisting of carbon nanotube yarn is carried out, and breaking-load index is calculated using average tensile strength (MPa) of carbon nanotube twisted-yarn and is arithmetic mean value of measured value of tensile strength measured considering three or more carbon nanotube twisted-yarns manufactured on same conditions as measuring component, and average-diameters of carbon nanotube twisted-yarn and is arithmetic mean value of three or more average diameters of carbon nanotube twisted yarn.    USE - Carbon nanotube twisted-yarn. Uses include but are not limited to probe of scanning probe microscope, cold cathode of field emission display, conductive resin, electrode of secondary battery, fuel cell, interlayer wiring material of large scale integrated circuits, and biosensor.    ADVANTAGE - The carbon nanotube twisted-yarn has excellent mechanical characteristics.    DETAILED DESCRIPTION - Carbon nanotube twisted-yarn has breaking-load index (F) of 150 nN or more in the state in which twisting of the carbon nanotube yarn is carried out, and the breaking-load index is calculated by formula: F=T( phi )2/(( phi )/d)2 (I), where T is average tensile strength (MPa) of carbon nanotube twisted-yarn and is arithmetic mean value of measured value of tensile strength measured considering three or more carbon nanotube twisted-yarns manufactured on the same conditions as a measuring component, ( phi ) is average-diameter ( mu m) of carbon nanotube twisted-yarn and is an arithmetic mean value of three or more average diameters of carbon nanotube twisted yarn manufactured on the conditions same as 3 or more carbon nanotube twisted-yarn which is provided to measurement of the tensile strength of the carbon nanotube twisted-yarn, and d is the average diameter (nm) of carbon nanotube and is arithmetic mean value of the average diameter of three or more carbon nanotubes which comprise the carbon nanotube twisted-yarn manufactured on the conditions same as 3 or more carbon nanotube twisted-yarn which is provided to the measurement of the tensile strength of the carbon nanotube twisted-yarn. INDEPENDENT CLAIMS are included for the following:    (1) spinning source, which comprises carbon nanotube array; and    (2) manufacture of carbon nanotube twisted-yarn, which involves forming carbon nanotube yarn which has length more than the length of the major axis direction of the carbon nanotube from several carbon nanotubes which comprises the spinning source containing carbon nanotube array, and twisting several carbon nanotube yarn and obtaining the carbon nanotube twisted-yarn.