Regular acrylic synthetic fibers which are usable as any of pile fabrics such as a high pile, boa, blanket, mat, and carpet and can impart a bulky feeling to fabrics; a process for producing the fibers; and a synthetic resin for acrylic synthetic fibers which is made mainly from acrylonitrile, characterized by having a thermoplastic ingredient content of 13 to 22 wt.%, a sulfo-containing vinyl monomer content of 0.3 to 2.0 wt.%, and a viscosity-average molecular weight Mη shown by the equation (1) of 43,000 to 60,000. The acrylic synthetic fibers are produced from the synthetic resin. Equation (1) Mη = (S/B-1)×53/6×10000
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