An information provision device for a vehicle allows information to be provided to a user appropriately, and includes an onboard device having a first control means that operates a display unit, and an external device having a second control means that outputs information from outside the vehicle to the first control means. The display unit includes a first region in which vehicle-status information is displayed and a second region in which the information from outside the vehicle is displayed. The first control means can determine priorities for the vehicle-status information and the information from outside the vehicle. The first control means operates the display unit such that either the first region or the second region, which contains high-priority information, is larger than the other. If prescribed conditions occur, the first control means operates the display unit such that the region containing low-priority information is larger than the other.