A fine inductor having a 3-dimensional coil structure is disclosed. The inductor includes an insulating layer having a groove, a plurality of first conductive patterns wherein the respective first conductive patterns cover bottom and both walls of the groove formed in the insulating layer, both ends of the respective first conductive patterns are extended over upper surface of both sides of the groove, and each of the first conductive patterns is disposed at a predetermined space between adjacent first conductive patterns, and a plurality of second conductive patterns wherein one ends of the respective second conductive patterns are connected to the one ends of the first conductive patterns extended over upper surface and the other ends of the respective second conductive patterns are connected to the other ends of the adjacent first conductive patterns extended over upper surface, thereby forming a coil structure together with the first conductive patterns.