To provide a vehicular gap display device which enables a driver to visually confirm how much a preceding travel vehicle and a self-vehicle come close more before the vehicular becomes a distance gap where the alarm of a vehicular gap alarm device operates.

An alarm distance which is previously set in accordance with the vehicular gap to the preceding travel vehicle at that time after the preceding travel vehicle and the self-vehicle become a tracking travel state for prescribed time and in which the alarm of the vehicular gap alarm device operates and an approach distance being a difference between the vehicular gap which is subsequently measured and the alarm distance are displayed on the vehicular gap alarm device. Thus, the operation situation of the vehicular gap alarm device becomes obvious by displaying the alarm distance and the approach distance and effect for giving a mark for safety travel can be obtained.