Sea-island composite polyester fiber

Provided is a sea-island composite polyester fiber which has two or more types of island parts having different orientations, and which is capable of obtaining a suede fabric having excellent fuzzing uniformity and fuzzing thickness. This sea-island composite polyester fiber has a sea-island structure having a sea portion and two or more different island portions, the outer diameter of the island portions being 1.0-7.0 [mu] m, the ratio (maximum orientation parameter/minimum orientation parameter) of the orientation parameter of the maximum orientation component to the orientation parameter of the minimum orientation component of the island portions being 1.03-1.15, and the orientation parameter of the maximum orientation component being 4.0-8.5. 本发明提供具有取向性不同的2种以上岛部，可获得起毛均匀性、起毛厚度优异的仿麂皮调原材料的海岛复合聚酯纤维。本发明的海岛复合聚酯纤维具有：具有海部和2种以上不同的岛部的海岛结构，岛部的外径为1.0～7.0μm，岛部的、最大取向成分的取向参数相对于最小取向成分的取向参数之比(最大取向参数/最小取向参数)为1.03～1.15，并且最大取向成分的取向参数为4.0～8.5。