PROBLEM TO BE SOLVED: To provide a frequency measuring instrument capable of measuring a plurality of mechanical vibrations by a single distance data measuring unit, separating the plurality of mechanical vibrations and measuring the respective frequencies in real time.SOLUTION: The frequency measuring instrument includes: a distance data measuring unit 2 for measuring a plurality of mechanical vibrations (Sand S) of different frequencies as single distance data; multiple signal flow generation means 31 for separating the single distance data into a plurality of pseudo signal flow data; a Fourier transformation unit 32 for applying Fourier transformation to the multiple pseudo signal flow data; and independent component analysis means 33 performing independent component analysis on the respective frequency components acquired by Fourier transformation to acquire the respective frequencies of the plurality of mechanical vibrations (Sand S).SELECTED DRAWING: Figure 1【課題】複数の機械的振動を1台の距離データ測定装置で測定し、複数の機械的振動を分離してそれぞれの周波数をリアルタイムで測定できる周波数測定器を提供する。【解決手段】周波数の異なる複数の機械的振動(S1,S2)を、単一距離データとして測定する距離データ測定装置2と、単一距離データを複数の疑似信号流データに分離する複数信号流生成手段31と、複数の疑似信号流データをそれぞれフーリエ変換するフーリエ変換装置32と、フーリエ変換によって得られた各周波数成分について独立成分分析をして複数の機械的振動(S1,S2)のそれぞれの周波数を取得する独立成分分析手段33と、を備える。【選択図】図1