A surface property inspection and sorting apparatus for evaluating a surface property of a spring-shaped member subjected to surface treatment by a surface treatment apparatus and sorting the spring-shaped members between good parts and bad parts, comprising: a surface property inspection device; a guide member; and a sorting device; the surface property inspection device comprising: an AC bridge circuit, an AC power supply for supplying AC power to the AC bridge circuit, and an evaluation apparatus for evaluating surface property of the spring-shaped member based on output signals from the AC bridge circuit; wherein the AC bridge circuit comprises: a variable resistor capable of dividing into a first resistor and a second resistor; an inspection detector comprising a coil capable of exciting an AC magnetic field, formed so that said coil can be disposed to excite an eddy current in the spring-shaped member; and a reference detector for detecting a reference state serving as a reference for comparing outputs from the inspection detector; wherein the first resistor, the second resistor, the reference detector, and the inspection detector constitute the AC bridge circuit; and wherein the evaluation apparatus is configured to evaluate the surface property of the spring-shaped member based on output signals from the AC bridge circuit while AC power is supplied to the AC bridge circuit, electromagnetic property of the spring-shaped members is detected by the inspection detector, and the reference state is detected by the reference detector; wherein the guide member is configured to guide the spring-shaped members so that the spring-shaped members carried from the surface treatment apparatus pass through the inspection detector as continuously running therethrough; and wherein the sorting device is configured to sort the spring-shaped members between good parts and bad parts after surface property has been evaluated by the inspection detector; characterized in that the surface property inspection device is configured to perform an evaluation and pass/fail judgment of the surface property of the spring-shaped member based on an integrated value which is calculated by integrating the output signals from the AC bridge circuit obtained during the period during which the single spring-shaped member is passing through the inspection detector. a surface property inspection device; a guide member; and a sorting device; the surface property inspection device comprising: an AC bridge circuit, an AC power supply for supplying AC power to the AC bridge circuit, and an evaluation apparatus for evaluating surface property of the spring-shaped member based on output signals from the AC bridge circuit; an AC bridge circuit, an AC power supply for supplying AC power to the AC bridge circuit, and an evaluation apparatus for evaluating surface property of the spring-shaped member based on output signals from the AC bridge circuit; wherein the AC bridge circuit comprises: a variable resistor capable of dividing into a first resistor and a second resistor; an inspection detector comprising a coil capable of exciting an AC magnetic field, formed so that said coil can be disposed to excite an eddy current in the spring-shaped member; and a reference detector for detecting a reference state serving as a reference for comparing outputs from the inspection detector; wherein the first resistor, the second resistor, the reference detector, and the inspection detector constitute the AC bridge circuit; and a variable resistor capable of dividing into a first resistor and a second resistor; an inspection detector comprising a coil capable of exciting an AC magnetic field, formed so that said coil can be disposed to excite an eddy current in the spring-shaped member; and a reference detector for detecting a reference state serving as a reference for comparing outputs from the inspection detector; wherein the first resistor, the second resistor, the reference detector, and the inspection detector constitute the AC bridge circuit; and wherein the evaluation apparatus is configured to evaluate the surface property of the spring-shaped member based on output signals from the AC bridge circuit while AC power is supplied to the AC bridge circuit, electromagnetic property of the spring-shaped members is detected by the inspection detector, and the reference state is detected by the reference detector; wherein the guide member is configured to guide the spring-shaped members so that the spring-shaped members carried from the surface treatment apparatus pass through the inspection detector as continuously running therethrough; and wherein the sorting device is configured to sort the spring-shaped members between good parts and bad parts after surface property has been evaluated by the inspection detector; characterized in that the surface property inspection device is configured to perform an evaluation and pass/fail judgment of the surface property of the spring-shaped member based on an integrated value which is calculated by integrating the output signals from the AC bridge circuit obtained during the period during which the single spring-shaped member is passing through the inspection detector.