PURPOSE:To provide the subject fiber having a specified-shape cross-section composed of eight leaf parts constituting an elliptical shape on the whole and capable of producing a high-grade woven fabric having a soft and dry touch, excellent in color development and brightness and having an elegant gloss. CONSTITUTION:A modified polyester containing a metal sulfonate group-containing isophthalic acid in an amount of 0.7-2.4mol% based on dicarboxylic acid components and a polyalkylene glycol of 90-6000 molecular weight in an amount of 0.2-10wt.% based on the polyester is spun to obtain the objective fiber having a cross-section composed of 8 leaf parts, a, a', b, b', c, c' and d, d' mutually facing symmetrically and constituting, on the whole, an elliptical shape satisfying 1.3