1 : An image analyzing apparatus for extracting voids from a three-dimensional image of a fiber-reinforced composite material, the image analyzing apparatus comprising: a processor which executes image processing to the three-dimensional image, wherein the processor: binarizes the three-dimensional image and creates a binary image; transforms the binary image into a distance and creates a distance image; executes closing processing to the binary image by using the distance image; extracts voids from differences between images before and after the closing processing; among the extracted voids, classifies voids that are adjacent to a background voxel as open voids, and classifies voids that are not adjacent to a background voxel as closed voids; and executes opening processing to the open voids in order to eliminate fake voids.