A periphery monitoring apparatus having an acquisition unit that acquires a three-dimensional model image. The three-dimensional model image indicates an irregular state of a road surface. The three-dimensional model image includes image data outputted from an imaging unit that takes a peripheral image including the road surface in a traveling direction of a vehicle and includes height data that indicates heights of individual regions of the road surface represented in the peripheral image. The periphery monitoring apparatus also includes a control that superimposes an indicator of a height of the road surface based on the height data onto each region included in the acquired three-dimensional model image and displays the three-dimensional model image on a display device.