Eddy current measuring sensor and inspection method using this eddy current measuring sensor

An inspection method characterized by comprising:

• inspecting a component to be measured by performing an eddy current measurement using an eddy current measuring probe sensor comprising:
• an exciting portion that i) includes a primary exciting portion that includes a main core formed of a cylindrical magnetic body and a main coil that is a solenoid coil wound in a circumferential direction around the main core, and a plurality of secondary exciting portions that include sub-cores formed of cylindrical magnetic bodies that are arranged around the primary exciting portion in a manner such that an axial direction of each sub-core is the same as an axial direction of the main core, the plurality of secondary exciting portions being configured to change the position of each sub-core independently in the axial direction of the main core relative to the primary exciting portion, and ii) applies a predetermined alternating current excitation signal to the component to be measured;
• and a detecting portion that detects a detection signal according to an eddy current from the component to be measured to which the predetermined alternating current excitation signal has been applied.