金属检测传感器(1)，利用频率组记忆机构(8)记忆有以侦测用频率与干涉确认用频率为1组之多组频率组，利用相互干涉搜索机构(9)以频率组之中的干涉确认用频率依照次序进行干涉搜索，未发生相互干涉时，利用共振频率设置机构(10)将用来检测有无如车辆的金属物(M)之电磁共振电路(2)的共振频率，设置为该频率组之中的侦测用频率。

A metal detection sensor (1) includes a frequency sets storage unit (8) that stores a plurality of frequency sets, each frequency sets including a use-for-detection frequency and a use-for-interference-check frequency. The metal detection sensor (1) also includes a mutual interference search unit (9) that performs an interference search by using sequentially the use-for-interference-check frequency of each of the frequency sets to determine whether there is a mutual interference. The metal detection sensor (1) further includes a resonant frequency setting unit (10) that sets the use-for-detection frequency of a particular frequency set, whose use-for-interference-check frequency has been found to have no mutual interference with other metal detection sensor (1), as a resonant frequency of an electromagnetic resonator circuit (2) to detect the presence of a vehicle (M).