THINNING DETECTION SYSTEM AND THINNING DETECTION METHOD

A thinning detection system (10) includes a current applying apparatus (120) configured to apply an AC current to electrodes installed on metal equipment (110) which is a monitoring object, a magnetic-field measuring apparatus (130) including an array of magnetic sensors configured to measure a magnetic field distribution of a surface side of the metal equipment; and a measurement managing apparatus (210) configured to estimate a thinning distribution of the metal equipment based on a magnetic field distribution difference which is a difference between a reference magnetic-field distribution which is obtained in a case where thinning has not occurred in the metal equipment and a measurement magnetic-field distribution which is an actual measurement result. The measurement managing apparatus (210) calculates a virtual current distribution of the metal equipment from the magnetic field distribution difference, and estimates the thinning distribution of the metal equipment on the basis of a virtual eddy current represented by the virtual current distribution.