Provided is a cable-type secondary battery including an electrode assembly and a cover member surrounding the electrode assembly, the electrode assembly including first and second electrodes of an elongated shape and a separator or an electrolyte interposed between the first and second electrodes, each electrode including a current collector having a cross section of a circular, asymmetrical oval or polygonal shape perpendicular to the lengthwise direction thereof and an electrode active material applied onto the surface of the current collector, wherein the cover member has at least partially a predetermined concavo-convex pattern in the direction of the electrode assembly. The cover member of a concavo-convex pattern may improve the flexibility of the cable-type secondary battery. When the cover member is applied to an electrode active material pattern layer, the flexibility of the cable-type secondary battery may be further improved.