An existing-area calculating device of a vehicle surrounding information informing device calculates an existing area where a hidden-area obstacle approaching an own vehicle is likely to exist, based on own-vehicle traveling information detected by an own-vehicle traveling information detecting device and information of a hidden-area obstacle of another-vehicle obstacle information detected by an another-vehicle obstacle detecting device. Then, an informing device informs the exiting area of the hidden-area obstacle. Accordingly, the passenger (driver) can surely recognize the existence of the hidden-area obstacle to take any proper action to avoid a possible collision with the hidden-area obstacle, thereby improving the reliability of the vehicle surrounding information informing device.