This invention relates to krill oil and a method for manufacturing the same. The method comprises preparing krill, adding protease to the krill and performing enzyme reaction, extracting eicosapentaenoic acid, docosahexaenoic acid, phospholipids, and astaxanthin from the krill after performing the enzyme reaction, and mixing the extracted eicosapentaenoic acid, docosahexaenoic acid, phospholipids, and astaxanthin. The protease may comprise one or more chosen from serine alkaline proteases and metallo neutral proteases. The serine alkaline proteases may comprise proteases separated from Bacillus licheniformis and the metallo neutral proteases may comprise proteases separated from Bacillus subtillis and Bacillus amyloliquefaciens.