An operation input device accepts non-contact operation on an operation image with a pointer. The operation input device includes a display panel and a sensing portion. The sensing portion outputs a first output value and a second output value. If a first operation image, which is an operation image corresponding to the second output value observed when the first output value is equal to a first reference value, and a second operation image, which is an operation image corresponding to the second output value observed when the first output value is equal to a second reference, differ, the display panel displays the first and second operation images with highlighting.