Patent ID: 8713809

Claim:
A fluxgate sensor comprising: a first wiring layer that is formed on a substrate; a first insulating layer that is formed so as to cover the first wiring layer; a magnetic core that is formed on the first insulating layer, and that includes a center portion, and first and second end portions that are continuous with the center portion and have a broader width than the width of the center portion, and are positioned at the two ends of the center portion; a second insulating layer that covers the magnetic core, and is formed on the first insulating layer; and a second wiring layer that is formed on the second insulating layer, wherein the first wiring layer and the second wiring layer have a plurality of wires that are substantially parallel to each other, and the two ends of the wires of the first wiring layer and of the wires of the second wiring layer are electrically connected together via portions where the first insulating layer and the second insulating layer have been selectively removed, and spiral-shaped first solenoid coils are wound around the first and second end portions, and a spiral-shaped second solenoid coil is wound around the center portion.