To provide a moving object detector with which it is possible to effectively detect a moving object such as a cockroach, and a proximity sensor used in the same.SOLUTION: A moving object detector 70 comprises: a plurality of first electrode portions 151p arrayed lengthwise and crosswise on a substrate 153； a plurality of second electrode portions 152p alternately arranged on the substrate lengthwise and crosswise, respectively, by being spaced apart by a prescribed distance from the first electrode portions； an oscillator circuit 71 constituting a CR oscillation unit together with the first and second electrode portions； a frequency-voltage conversion unit 74 for converting the oscillation signal of the oscillator circuit into a voltage signal, with the oscillation frequency of the oscillator circuit determined by the dielectric constant and the size of an object existing across the first and second electrode portions, the oscillation frequency varying as the object moves lengthwise and crosswise； and a determination unit 76 for determining whether or not the object is a target on the basis of the vibration frequency and voltage value of the voltage signal, the voltage value of the voltage signal reflecting the reciprocal of the oscillation frequency and vibrating according to a change of the oscillation frequency.SELECTED DRAWING: Figure 6【課題】 ゴキブリなどの移動体を効果的に検出することができる移動体検出装置及びそれに用いられる近接センサを提供すること。【解決手段】 移動体検出装置７０は、基板１５３上に縦横に配列される複数の第１電極部分１５１ｐと、基板上に第１電極部分と所定の間隙を隔てて縦横各々に交互配置される複数の第２電極部分１５２ｐと、第１、第２電極部分とともにＣＲ発振部を構成する発振回路７１と、発振回路の発振周波数は第１、第２電極部分を跨いで存在する物体の比誘電率及び大きさに応じて決まり、発振周波数は物体の縦横の移動に応じて変動する、発振回路の発振信号を電圧信号に変換する周波数電圧変換部７４と、電圧信号の電圧値は発振周波数の逆数を反映し且つ発振周波数の変動に応じて振動する、電圧信号の振動周波数と電圧値とに基づいて物体が目標物であるか否かを判定する判定部７６とを具備する。【選択図】図６
