The present invention can significantly improve the quality of the test by increasing the contact force of the subject located in a narrow space by dramatically reducing the size, and to provide a conversion type portable magnetic particle detector capable of appropriate conversion and use according to the shape of the subject equipment in the field Its purpose is to.;According to the present invention, in the portable magnetic particle detector for inspecting the surface defects of the subject 2, the coil 33 connected to the power supply and the first iron core 32 on which the coil 33 is wound and the coil A body portion 31 formed in a straight line and having a first coating portion protruding from both sides of the straight body portion 31 includes a 33 and an insulating coating portion 34 that protects the first iron core 32. A limit switch 35 including a second iron core 32a rotatably coupled to the iron core 32, wherein the body part 31 is provided with a limit switch 35 for turning on / off a power supply. 35 is disposed, and coil protective material 34a for protecting the coil 33 is disposed on both side surfaces of the body portion 31, and the second iron core 32a is disposed on the test object 2. Convertible portable, characterized in that to check the surface defects by rotating freely in the horseshoe type and "L" shape and "I" shape according to the shape of the The magnetic flaw detector is provided.
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