A stereoscopic image observation apparatus comprising polarizing glasses and a display device, wherein the polarizing glasses comprises a left-eye region and a right-eye region, each of which comprises a positive or negative uniaxial retardation layer (21A, 22A) and a polarizer (21B, 22B); the display device comprises a second polarizer and a display unit configured to generate a left-eye image signal and a right-eye image signal; and a filter unit comprising a first region and a second region respectively having retardation layers to differently control polarization states of the left-eye image signal and the right-eye image signal generated by the display unit, wherein the first region and the second region are alternately formed adjacent to one another in stripe shapes or are alternately disposed adjacent to one another to form a grid pattern, wherein the retardation layers of the first and second regions of the filter unit have uniaxiality with an opposite sign to the uniaxial retardation layer (21A, 22A) of the polarizing glasses, wherein the retardation layers of the first region and the second region of the filter unit have the same wavelength dispersion characteristics, wherein both the retardation layers of the first region and the second region of the filter unit have normal wavelength dispersion characteristics, flat wavelength dispersion characteristics, or reverse wavelength dispersion characteristics, wherein one of the left-eye image signal and the right-eye image signal respectively passed through the first and second regions is a left-circularly polarized signal, and the other is a right-circularly polarized signal, wherein the retardation layer of the first region of the filter unit and the retardation layer of the left-eye region are uniaxial retardation layers having opposite signs and have substantially the same retardation and optical axes (SF, SG) formed in substantially the same direction on the basis of the second polarizer, wherein the retardation layer of the second region of the filter unit and the retardation layer of the right-eye region are uniaxial retardation layers having opposite signs and have substantially the same retardation and optical axes (SF, SG) formed in substantially the same direction on the basis of the second polarizer, wherein, in a state where the polarizing glasses are placed so that the absorption axis of the polarizer in the left-eye region and the absorption axis of the polarizer in the right-eye region are perpendicular to the absorption axis of the second polarizer, the following conditions are satisfied: θ 1 − θL ≤ 15 °, and θ 2 − θR ≤ 15 °, wherein θ1 is an angle between an optical axis of the retardation layer in the first region and an absorption axis of the second polarizer, wherein θL is an angle between an optical axis of the retardation layer in the left-eye region and the absorption axis of the second polarizer, wherein θ2 is an angle between an optical axis of the retardation layer in the second region and the absorption axis of the second polarizer, wherein θR is an angle between an optical axis of the retardation layer in the right-eye region and the absorption axis of the second polarizer. wherein θ1 is an angle between an optical axis of the retardation layer in the first region and an absorption axis of the second polarizer, wherein θL is an angle between an optical axis of the retardation layer in the left-eye region and the absorption axis of the second polarizer, wherein θ2 is an angle between an optical axis of the retardation layer in the second region and the absorption axis of the second polarizer, wherein θR is an angle between an optical axis of the retardation layer in the right-eye region and the absorption axis of the second polarizer.