An organic light emitting display device includes a first substrate, a pixel structure, a second substrate, a reflective member, and a light transmitting member. The first substrate includes a plurality of pixel regions. Each of the pixel regions has sub-pixel regions and a reflective region surrounding the sub-pixel regions. The pixel structure is disposed in each of the sub-pixel regions on the first substrate. The second substrate is disposed on the pixel structure. The reflective member has an opening disposed in each of the sub-pixel regions, and is disposed in the reflective region of the second substrate. The light transmitting member covers the opening of the reflective member and partially overlaps the reflective member. The light transmitting member blocks ultraviolet rays and transmits a predetermined light.