To provide a finder optical system suitable for a photographing optical system by arranging the incident surface and the image pickup surface of the photographing optical system nearly perpendicularly.

This device is provided with the photographing optical system, an imaging device and the finder optical system, and the photographing optical system has only one surface as a surface for reflecting and deflecting luminous flux. When length on an optical axis from the surface of the photographing optical system nearest to an object side at the time of focusing on infinity to the surface for reflecting and deflecting the luminous flux is defined as LF and length on the optical axis from the surface for reflecting and deflecting the luminous flux to the image pickup surface of the imaging device is defined as LR, the device satisfies a following condition (1). The incident surface and the exit surface of the finder optical system are made nearly parallel. (1) 1<LR/LF.