VEHICLE PERIPHERY MONITORING DEVICE

A vehicle periphery monitoring device is provided with a symmetrical image portion extraction unit (21) which extracts from an image picked up by a camera, a first image portion (A1) and a second image portion (A2) which are line-symmetric to each other in the horizontal direction; an expanded region setting unit (22) which sets a first expanded region (B1) which includes the first image portion (A1); an expanded search range setting unit (23) which sets an expanded search range (C), which is wider than the size of the first expanded region (B1), including the second image portion (A2); and an object class recognition unit (24) which searches within the expanded search range (C) for a second expanded region (B2) in which a correlation degree to a mirror reflection (B1m) of the first expanded area (B1) is greater than or equal to a predetermined level, and when the second expanded region (B2) is found, recognizes the image containing the first image portion (A1) and the second image portion (A2) as the image of another vehicle.