1. An image generation device that generates an output image including a road image based on plural input images that are captured by plural cameras mounted to a body to be operated, the image generation device comprising: a control part that arranges input image portions of two cameras of the plural cameras that correspond to an overlapping area of image capturing ranges of the two cameras to form a lattice pattern on the output image; wherein the lattice pattern includes as a unit pattern a region that is defined by two circles having a center at a position of a first camera of the two cameras, and two circles having a center at a position of a second camera of the two cameras.