Provided is a video display device that quickly determines, when a video signal of unknown resolution is input from the outside, the resolution of the video signal to correctly display a video. The video display device includes: A/D conversion unit for converting an analog video signal into a digital video signal by using a dot clock; clock generation unit for generating a dot clock of a predetermined frequency; phase adjustment unit for adjusting a phase of the dot clock; and control unit for estimating vertical resolution of the analog video signal based on a vertical synchronization signal and a horizontal synchronization signal, causing the clock generation unit to generate a dot clock of a frequency that corresponds to each pre-registered horizontal resolution candidate, calculating a maximum total difference value of the digital video signal while causing the phase adjustment unit to adjust a phase of the dot clock, and determining, among all the horizontal resolution candidates, the horizontal resolution, in which the maximum total difference value is largest, to be horizontal resolution of the analog video signal.