This image processing device compresses images sequentially captured by an image capturing device (32). The image processing device is provided with: a hardware encoder (302) which compresses, by using a dedicated circuit, the images sequentially captured by the image capturing device; software encoders (306, 311) which compress, on a general-purpose processor, the images sequentially captured by the image capturing device such that the total number of pixels is lowered compared to that used in the hardware encoder; a non-volatile memory (303) which sequentially stores the captured images compressed in the hardware encoder; and transmission units (308, 308a, 308b) which transmit, by using wireless communication, the captured images compressed in the software encoders to reception-side devices (2, 2a, 4, 5) that are external devices of the image processing device.