To provide an intervehicular distance controller for controlling simply a change of a search range for a preceding vehicle to cope with a lost phenomenon.

An irradiation beam is emitted within a fixed irradiation angle range α, on a vertical face, a search angle range determining means changes a search angle range from an angle range β into an angle range γ, when an intervehicular distance comes to a prescribed value or less, within the fixed irradiation angle range α, when a vehicular speed comes to a prescribed value or less, or when moved to a low-speed intervehicular distance control condition.