To provide a synthetic keratin fiber having a texture resemble to human hair and animal hair by dissolving a keratin protein and spinning the solution by solution spinning.

Provided are (1) an synthetic keratin fiber obtained by the solution spinning of a reduced keratin solution; (2) the synthetic keratin fiber of (1) in which the reduced keratin solution is obtained by reducing a keratin protein to form a solution; (3) the synthetic keratin fiber of (1) or (2) in which the keratin protein is feather; (4) a hair-dressing product using the synthetic keratin fiber of any of (1) to (3); (5) a woven fabric using the synthetic keratin fiber of any of (1) to (3); and (6) a nonwoven fabric produced by using the synthetic keratin fiber of any of (1) to (3).