A splittable conjugate fiber for obtaining a fiber structure excellent in denseness and bulkiness includes a polyamide resin composition and a fiber-forming polymer not having an affinity with the polyamide resin composition. The polyamide resin composition and the fiber-forming polymer are combined with each other in a fiber longitudinal direction. The polyamide resin composition contains aromatic polyamide and aliphatic polyamide. Preferably, the aromatic polyamide is a nylon MXD6 polymer, and the aliphatic polyamide is a nylon 6 polymer.