Patent ID: 8405820

Claim:
A ranging device, comprising: a lens array member which has a first ranging lens and a second ranging lens, optical axes of the pair of ranging lenses being parallel to each other, and first and second optical images of a subject being formed by the first and the second ranging lenses respectively; a mirror array member which has first and second reflecting members, each of the pair of reflecting members being provided with a reflecting plane which reflects a corresponding optical image of the first and the second optical images from a corresponding ranging lens of the pair of ranging lenses; a medium mirror member which has a first reflecting plane and a second reflecting plane, the medium mirror member being arranged between the pair of reflecting members, the first and the second reflecting planes reflecting the first and the second optical images reflected by the reflecting planes of the first and the second reflecting members, respectively, to a predetermined direction; an imaging element which is arranged at a position receiving the first and the second optical images reflected by the first and the second reflecting planes of the medium mirror member respectively to the predetermined direction, and is configured to convert the first and the second optical images to electronic signals; and an electronic circuit which is configured to calculate a distance to the subject based on the electronic signals output from the imaging element, wherein: the medium mirror member and the mirror array member are formed separately, the lens array member includes a flat plate part, the mirror array member includes a flat plate part, and the lens array member and the mirror array member are integrally formed by integrating the flat plate part of the lens array member and the flat plate part of the mirror array member.