An inductor includes a first core, a second core, a protruding structure, at least two gaps and a conducting wire. The first core has a protruding portion. The second core is disposed opposite to the first core. The protruding structure protrudes from the protruding portion of the first core and toward the second core. The at least two gaps are between the protruding portion of the first core and the second core. The conducting wire winds around at least one of the first and second cores. The conducting wire has a specific resistance value of 1.42 μΩm or lower.