PURPOSE: To simultaneously view an object and a required information display device at the time of viewing through an optical finder concerning the optical finder used in a video camera or a 35mm still camera, etc.

CONSTITUTION: The display device is arranged so as to permit display light emitted from the display device to enter at a position to be θ1<θ<θ2 by making an effective diameter on a lower side larger than the effective diameter on an upper side. Therefore, the display device can be arranged ahead of the optical finder without interrupting the effective angle of view of the optical finder for the object and an effect that a user can simultaneously view the object and display at the time of viewing through the optical finder is obtained.