Defect detection device enabling easy removal of magnetic impurities

A defect detection device enabling easy removal of magnetic impurities, the defect detection device comprising:

• a main body of cylindrical shape housing a magnet for magnetizing a measured object and having internal threads formed in opposite ends thereof;
• a sensor unit provided with a plurality of magnetic sensors along an outer surface of the main body;
• a coil wound around an outer surface of the sensor unit;
• a protective casing surrounding the main body provided with the sensor unit and the coil;
• a first support and a second support that are hollow and are coupled to opposite ends of the protective casing respectively;
• a first fixture and a second fixture respectively passing through the first support and the second support and engaged with the internal threads formed in the opposite ends of the main body;
• and
• a magnetic impurity removal cap that is hollow and is coupled to one end of the protective casing in a state in that the first support and the first fixture have been removed.