The image processing device 4 includes an area detection unit 451 that detects an area that is not suitable for observation in the image for each image included in the image group acquired in time series, and an area detection unit 452 that, for each image included in the image group, An importance degree calculation unit 452 that calculates the importance degree of the image on the basis of an area that is not suitable for the observation in the observation area, and calculates the importance degree in time series, and determines whether or not the calculated value exceeds the threshold value And a determination unit 453 for determining whether or画像処理装置4は、時系列で取得された画像群に含まれる画像毎に、当該画像内の観察に適さない領域を検出する領域検出部451と、画像群に含まれる画像毎に、当該画像内の前記観察に適さない領域に基づいて、当該画像の重要度を算出する重要度算出部452と、当該重要度を時系列に演算するとともに、当該演算値が閾値を超えたか否かを判定する判定部453とを備える。
