OPTICAL DEVICE AND DISPLAY DEVICE

An optical device includes: a light guide plate 120; a first deflection means 130 arranged on at least one of a first surface or a second surface of the light guide plate 120, the first deflection means 130 deflecting light incident on the light guide plate 120 to cause the light incident on the light guide plate 120 to be totally reflected inside the light guide plate 120; and a second deflection mean 140 arranged on at least one of the first surface or the second surface of the light guide plate 120, the second deflection means 140 deflecting the light propagated inside the light guide plate 120 by total reflection to cause the light propagated inside the light guide plate 120 by total reflection to be emitted from the light guide plate 120, in which the light guide plate 120 includes: a substrate 500 including a first surface and a second surface facing the first surface; a first planarizing film 511 formed on the first surface of the substrate 500, the first planarizing film 511 containing an organic material; and a second planarizing film 512 formed on the second surface of the substrate 500, the second planarizing film 512 containing an organic material. The substrate 500 can contain a resin material.