To provide an inductor and a circuit apparatus strong against a shock, such as falling, etc.

Supposing that a substrate 5 falls in the direction of an arrow A and a perpendicular shock is added to the substrate 5, the force of this shock is transmitted from the substrate 5 to the magnetic substance core 2 through each lead 4. At this time, if it bends so that each lead 4 may draw some approximate spirals, an inductor 1 receives the force of the direction of rotation through each lead 4 describing some approximate spirals, and the force of the shock turns into the torque of the inductor 1, and is distributed. Therefore, the force of the shock does not need to concentrate on the root of each lead 4, and it is hard to damage the inductor 1.