1. An image analysis device comprising: a DSA image acquisition unit configured to acquire image data of a plurality of sequential DSA images of a same object; a parameter value acquisition unit configured to acquire a parameter value per pixel, based on time variation of pixel values per pixel corresponding to a same region of the object in the image data of a plurality of sequential DSA images; a color allocation unit configured to generate a color map in which a color in accordance with the parameter value is allocated per pixel corresponding to the same region of the object; and a time phase image generation unit configured to generate color image data of time phase images respectively corresponding to a plurality of time phases, by reflecting information in accordance with pixel values of the DSA images to each pixel of the color map.