Disclosed is a method that can detect adhesion of a specific liquid in distinction from other liquids, and can make a portion to which the liquid adheres disposable. A frequency characteristic acquisition unit for acquiring a frequency characteristic when an AC signal is input to at least two conductors provided on a fiber sheet, and the frequency characteristic acquisition unit acquires a predetermined frequency characteristic. And a detection signal output unit that outputs a detection signal in the case of being performed. [Selection] Figure 1【課題】他の液体と区別して特定の液体の付着を検知可能であり、かつ、液体の付着する部分を使い捨て可能とする。【解決手段】検知装置が、繊維シートに設けられた少なくとも２つの導電体に交流信号を入力した場合の周波数特性を取得する周波数特性取得部と、前記周波数特性取得部が所定の周波数特性を取得した場合に検知信号を出力する検知信号出力部と、を具備する。【選択図】図１
