Provided is a vehicle information provision device that avoids cost increases and is adaptable to changes in specifications for the interface section of an external device, when providing external information held by the external device to the user of a vehicle, via a display unit provided in an on-board device. The vehicle information provision device comprises the on-board device (102) having: a device unit (200) having a display unit (204) that displays each type of vehicle status to the user as vehicle status information, and a first control means (202) that operates the display unit (204); and a communications unit (220) that communicates between the device unit (200) and the external device (103) that outputs external information about the vehicle to the device unit (200). The communications unit (220) is configured so as to be connectable to the device unit (200) via an attachment/detachment means (215), and outputs to the device unit (200) signals including at least either a video signal or an audio signal, as the external information for the vehicle, when the device unit (200) is connected to the communications unit (200) via the attachment/detachment means (215).