The optical observation apparatus includes an optical element which reflects a first wavelength region light from an object to introduce the light to an eyepiece part, and a light source which emits a second wavelength region light. A wavelength-selective optical film which transmits the first wavelength region light and reflects the second wavelength region light is disposed inside the optical element. The optical observation apparatus superimposes an image formed by the second wavelength region light reflected by the wavelength-selective optical film on an object image formed by the first wavelength region light transmitted through the wavelength-selective optical film to cause an observer to observe the object image with the superimposed image through the eyepiece part. The optical observation apparatus can superimpose an optional image on the object image to enable the observer to observe these images without a deterioration of viewfinder performance.