To improve an imaging performance.

An optical/imaging system 12L has an imaging surface for capturing a view field VF_L, and outputs L side raw image data indicating the view field VF_L. An optical/imaging system 12R has an imaging surface for capturing a view field VF_R, and outputs R side raw image data indicating the view field VF_R. The view fields VF_L and VF_R are partially in common, and the L side raw image data and the R side raw image data are selectively outputted. A CPU 34 adjusts imaging conditions of the optica/imaging systems 12L and 12R in common on the basis of the L side image data, the R side raw image data and weighting coefficients Wcrnt and Wprv. The CPU 34 also identifies which of the L side raw image data and the R side raw image data the raw image data of a present frame is, and changes values of the weighting coefficients Wcrnt and Wprv.