Provided is an inductor with which miniaturization can be achieved while ensuring electric insulation between a coil and a core. The inductor (1) is provided with a core (2), a bobbin (3), and an annular coil (4). The core (2) includes a core portion (2a) extending in a central axis (O) direction, two guard portions (2b) expanding from both ends in the central axis (O) direction of the core portion (2a) toward respective outer diameter sides, and a side wall portion (2c) connecting the outer diameter ends of the two guard portions (2b). The bobbin (3) includes a tube portion (3a) extending inthe central axis (O) direction and fitting onto the outer periphery of the core portion (2a). The coil (4) is wound onto the core portion (2a) with the tube portion (3a) interposed therebetween. The bobbin (3) further includes a flange portion extending from both ends of the tube portion (3a) and separating the guard portions (2b) and the coil (4) from each other. The flange portion (3b) has on asurface thereof opposing at least one of the guard portions (2b) a positioning portion (3c) which is positioned further toward the inner diameter side than the outer diameter end of the flange portion(3b), and which protrudes on the guard portion (2b) side, with a distal end abutting the guard portion (2b).