False twist yarn which resembles worsted yarn composed of high-denier multifilaments with a fineness of 4 de or more and low-denier multifilaments with a fineness of 0.7 to 2 de, which comprises (a) an alternatingly twisted winding portion comprising a core portion formed of the high-denier multifilaments and a covering (sheath) portion formed of the low-denier multifilaments wound around the core portion in a substantially bundled state, (b) an opened portion wherein a core portion formed of the high-denier multilaments is covered by a covering portion formed of the low-denier multifilaments in such a manner that the multifilaments of the covering portion are opened and cover the core portion in parallel with the yarn axis with alternatingly reversing the covering direction, and (c) and entangled portion wherein the high-denier multifilaments and the low-denier multifilaments are entangled with each other, wherein (d) the alternatingly twisted winding portion and the entangled portion form a bundle portion, (e) the length of the opened portion, L1, is at least a half of that of the bundle portion, L2, and (f) the length of the low-denier multifilaments per unit length of the yarn is by 13 to 25 % longer than that of the high-denier multifilaments.
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