Topic With the device which the method in order to detect surface adjacent defect with leakage flux measurement and both of the defect which opens to the surface and the defect which hides makes that it detects in high sensitivity possible and corresponds it offers.Solutions At least in order to detect a leak magnetic field which occurs in the method in order to detect the surface adjacent defect of the inspection sample which partly consists of the ferromagnetic material, due to defect, inspection capacity of the inspection sample magnetizing, it is scanned. Simultaneously, magnetizes by the interchange magnetic field which is superimposed to that inspection capacity by the fixed magnetic field. Although this method is executed, the appropriate leakage magnetic field survey instrument is stated. Selective figure Figure 1
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