PROBLEM TO BE SOLVED: To provide a signal detector capable of preventing erroneous detection of an electromagnetic noise as a detection object signal, and to provide a signal detection method.SOLUTION: A signal detector 10A has: electrodes 12, 14 for taking a signal of a measurement object a signal analysis part 30 for analyzing an input signal comprising a detection object signal and an electromagnetic noise, and generating an output signal and a signal removal part 20 for removing the detection object signal from the input signal based on instruction from the signal analysis part 30.COPYRIGHT: (C)2016,JPO&INPIT