An image processing device including an image processing section having one or more image processing modules and buffer modules having a buffer is provided. The buffer module, recognizes a number of image processing modules which are connected at the following stage of its own module; stores, for each of the following image processing modules, a head position of un-read image data among image data which is stored in the buffer; and each time image data is requested from an following image processing module, causes the image processing module to read, in a read data amount which is set in advance for its own module at each of the individual following image processing modules or which is designated each time of the request, image data which is stored in the buffer, from the head position corresponding to the image processing module.