A video processing device processing input videos, includes a video processing unit that processes the input videos; and a control unit that sets a control value for controlling the video processing unit, wherein an entire input video is constituted by combining the input videos, and among partial areas associated with the respective input videos constituting the entire input video, one of the partial areas is defined as a first partial area, and another of the partial areas adjacent to, the first partial area is defined as a second partial area, and when processing which is performed, by referring to a pixel value in one of the first partial area and the second partial area, on another of the first partial area and the second partial area, is defined as adjacent boundary processing, the video processing unit performs the adjacent boundary processing on the entire input video, and generates processed videos.