A camera viewer device including an assembling sheet member developed and changed in shape between a box-shaped angle finder and a direct viewing finder. The sheet member includes first and second mirror wall portions with first and second inner mirrors, an attachment wall portion attached to a back face of a camera body, and an upper wall portion. In the box-shaped angle finder, the first mirror reflects an image of a subject in a display panel on the back face of the camera body and downwardly projects the image of the subject, the second mirror upwardly projects the projected image, a window portion of the attachment wall portion is opposed to the display panel, and a window portion of the upper wall portion is opposed to the second mirror wall portion to look into the interior of the assembled sheet member through the window portion of the upper wall portion.