A stereoscopic endoscopic image processing apparatus includes: a synchronization adjustment portion that performs a synchronization adjustment between a left-eye image signal and a right-eye image signal； and an image analysis portion that analyzes a region that an image of a treatment instrument occupies in a peripheral region around a central region in an image of one image signal. The image analysis portion includes: an image dividing portion that segments the peripheral region to divide the peripheral region into a predetermined number of regions； a color component analysis portion that analyzes color components within the respective regions； an image edge component extraction portion that extracts edge components within the respective regions； a treatment instrument region evaluation portion that evaluates a size of a region that an image of a treatment instrument occupies in the peripheral region； a blur information generation portion that generates information regarding a blur region as a region in which to perform blur processing on the image in the peripheral region in accordance with an analysis result of the image analysis portion, and information regarding a blur intensity when performing blur processing on the image in the peripheral region； and an image compositing portion that composites and outputs a 3D image with respect to blur processing is performed on each of a left-eye image and a right-eye image in accordance with a generation result of the blur information generation portion.
