An image processing device has an image processing section and a processing managing section. The image processing section has one or more image processing modules and one or more buffer modules. Each image processing module has an image processing engine and a control section. The image processing engine carries out a predetermined image processing on image data in units of a unit processing data amount. The control section inputs image data which is acquired from a preceding stage of its own module, in data amount units needed in order for the image processing engine to carry out processing in units of the unit processing data amount. Also, the control section outputs, to a following stage of its own module, image data, which has undergone a predetermined image processing by the image processing engine, or a processing result of the predetermined image processing.