PROBLEM TO BE SOLVED: To improve the detection accuracy of a peak of a pulse wave. SOLUTION: A first correction signal as a result of performing a first correction and a second correction are performed using first and second signals extracted from image data and fluctuating due to a pulse wave of a living body. The influence of noise on each of the first and second correction signals, the signal dividing unit that divides the second correction signal as a result of the operation into sections for each period of the pulse wave, and the second correction signal for each section. It has an influence degree calculation unit for calculating a value indicating the degree of influence, and a peak time detection unit for detecting the peak occurrence time of the correction signal having the smaller degree of influence for each section. [Selection diagram] Fig. 3【課題】脈波のピークの検出精度を向上させることを目的としている。【解決手段】画像データから抽出された、生体の脈波により変動する第一及び第二の信号を用いて、第一の補正を行った結果の第一の補正信号と、第二の補正を行った結果の第二の補正信号と、を前記脈波の周期毎の区間に分割する信号分割部と、前記第一及び前記第二の補正信号のそれぞれについて、前記区間毎に、ノイズの影響の度合いを示す値を算出する影響度算出部と、前記区間毎に、前記影響の度合いが小さい方の補正信号のピークの発生時刻を検出するピーク時間検出部と、を有する。【選択図】図３
