A measurement device comprising: a first image capturing unit configured to obtain a first image (P1) by image-capturing liquid containing tangible components flowing through a flow path , and a second image capturing unit having an image-capturing magnification higher than that of the first image capturing unit and which is configured to obtain a second image (P2) by image-capturing the liquid containing tangible components simultaneously with the obtention of the first image (P1) by the first image capturing unit ; and a calculation unit configured to: sort, by using clipped images obtained by clipping the tangible components included in the first image (P1) and the second image (P2), the tangible components into different types, and calculate, by using a total number of the tangible components clipped out of the first image (P1) and included in a specified category, as well as a respective ratio of a number of each type of tangible component clipped out of the second image (P2) and included in the specified category relative to a total number of the tangible components in the specified category clipped out of the second image (P2), a corrected number of each type of tangible component included in the specified category, by multiplying the total number of the tangible components clipped out of the first image (P1) and included in the specified category by the respective ratio; wherein the first image capturing unit and the second image capturing unit have same focal positions on respective optical axes thereof. a first image capturing unit configured to obtain a first image (P1) by image-capturing liquid containing tangible components flowing through a flow path , and a second image capturing unit having an image-capturing magnification higher than that of the first image capturing unit and which is configured to obtain a second image (P2) by image-capturing the liquid containing tangible components simultaneously with the obtention of the first image (P1) by the first image capturing unit ; and a calculation unit configured to: sort, by using clipped images obtained by clipping the tangible components included in the first image (P1) and the second image (P2), the tangible components into different types, and calculate, by using a total number of the tangible components clipped out of the first image (P1) and included in a specified category, as well as a respective ratio of a number of each type of tangible component clipped out of the second image (P2) and included in the specified category relative to a total number of the tangible components in the specified category clipped out of the second image (P2), a corrected number of each type of tangible component included in the specified category, by multiplying the total number of the tangible components clipped out of the first image (P1) and included in the specified category by the respective ratio; sort, by using clipped images obtained by clipping the tangible components included in the first image (P1) and the second image (P2), the tangible components into different types, and calculate, by using a total number of the tangible components clipped out of the first image (P1) and included in a specified category, as well as a respective ratio of a number of each type of tangible component clipped out of the second image (P2) and included in the specified category relative to a total number of the tangible components in the specified category clipped out of the second image (P2), a corrected number of each type of tangible component included in the specified category, by multiplying the total number of the tangible components clipped out of the first image (P1) and included in the specified category by the respective ratio; wherein the first image capturing unit and the second image capturing unit have same focal positions on respective optical axes thereof. <EOS>