To obtain a pitch fiber capable of producing a pitch-based fiber excellent in tensile strength, modulus of elasticity, compressive strength and rigidity by conjugately spinning plural pitches having different contents of an optically anisotropic phase.

This pitch fiber is obtained, e.g. by conjugately spinning (A) a pitch obtained by treating heavy oil at 390-450°C and 0.5-3MPa pressure for 1-5 hours and having 80-100% content of an optically isotropic phase as a core part with (B) a pitch obtained by hydrogenating a carbonous pitch in the presence of a hydrogenation catalyst and having 5-40% content of the optically isotropic phase as a sheath part.