In order to improve parallax accuracy and output an accurate distance, this stereo image processing device is provided with: a stereo image capture unit that captures a plurality of images with different viewpoints; a synchronization unit that synchronizes image capture times when the plurality of images are captured; image correction units that parallelize and output the plurality of images captured by the stereo image capture unit; a parallax measurement unit that detects parallax on the basis of the images outputted by the image correction units; and an object detection unit that detects an object on the basis of the parallax measured by the parallax measurement unit, and is further provided with delay amount holding units that each hold, pixel by pixel, delay times from the image capture times synchronized by the synchronization unit, and an object parallax correction unit that corrects the parallax of the object detected by the object detection unit on the basis of the delay times held by the delay amount holding units.