DETECTION DEVICE

To provide a detection device capable of detecting the physical property of an object to be inspected within a relatively narrow area. A detection device 1 includes excitation coils 10 and 20 each wound such that magnetic flux generated in the inner diameter area thereof flows out from one opening end thereof toward the other opening end, magnetic members 31 and 32 that induce magnetic flux from an opening end 22 of the excitation coil 20 to an opening end 11 of the excitation coil 10, and a magnetic detection part 40 that detects magnetic flux flowing through the magnetic members 31 and 32. In this detection device 1, magnetic flux flowing out from an opening end 12 of the excitation coil 10 to an opening end 21 of the excitation coil 20 is applied to an object A to be inspected to thereby detect the physical property of the object A to be inspected. The excitation coils 10 and 20 that generate magnetic fluxes flowing in mutually reverse directions are used, so that magnetic flux can be concentrated within a relatively narrow area of the object A to be inspected. This allows detection of the physical property of the object A to be inspected within a relatively narrow area.