To provide a stereoscopic microscope such as a microscope for medical operation, etc., where the size of the mirror can be made almost equal to that of a normal microscope consisting of two optical axes, a good picture free from crosstalk can be provided and miniaturization and easiness to adjust are realized compared with a normal microscope consisting of the two optical axes.

A stereoscopic microscope having a plurality of eyepiece optical systems for observing an optical image is provided with at least one zoom optical system 5 and an optical element 8 which modulates the images of different parallaxes through an optical element 4 whose characteristic can be modulated with time, allows the plurality of modulated images pass through the system 5 and separates the images after passing through to images of different parallaxes inside a mirror 1.