Abstract: A composite spinneret that discharges a composite polymer composed of an island polymer and a sea polymer, the composite spinneret satisfying (1) and (2): (1) the composite spinneret comprises: a distribution device; a nozzle plate; a flow contraction plate; and (2) the nozzle plate has a nozzle hole collection including a plurality of discharge holes, and at least one sea-island discharge hole group including any of (i) to (v): (i) the sea discharge holes and the island discharge hole; (ii) the composite polymer discharge holes; (iii) the sea discharge holes and the composite polymer discharge holes; (iv) the island discharge holes and the composite polymer discharge holes; and (v) the sea discharge holes, the island discharge holes and the composite polymer discharge holes.

Abstract: A multicomponent fiber includes a sea component and an island component, wherein in cross-section observation of the multicomponent fiber, the multicomponent fiber includes a sea-island region with the plurality of island components arranged in the sea component; and one or more sea component regions formed only of the sea component between the sea-island region, and a width (H) of the sea component region is larger than a maximum value of a distance (W) between island components existing in the sea-island region and neighboring each other.