Abstract: There is provided a apparatus and method for detecting defect using multiple phase selectable pulsed eddy current (PEC), comprising: an object to be determined as to presence of a defect; a PEC irradiation unit positioned close to a surface of the object, that irradiates a PEC signal to the object and receives a defect or defect-free signal reflected from the object as a result of irradiation; a measurement unit connected to the PEC irradiation unit by a cable, being input with the reflected PEC signal received in the PEC irradiation unit, and stored with a program for time-sharing and displaying the PEC signal on a graph, that processes a resultant value to be displayed; a display unit connected to the measurement unit, that displays the resultant value being output from the measurement unit; and an input unit connected to the measurement unit, that sets a phase (a multiple phase selectable value through selecting an arbitrary location by time-sharing the measured PEC signal), frequency (a frequency value of