An optical member includes: a light guide part having a first refractive index, where a first area and a second area are sequentially defined on an upper surface of the light guide part in a first direction from a side surface of the light guide part; and a first pattern part disposed on the upper surface of the light guide part, having a second refractive index smaller than a first refractive index of the light guide part, where the first pattern part reflects a portion of light incident from the light guide part. A first area ratio of an overlapping portion of the first pattern part with the first area to the first area is greater than a second area ratio of an overlapping portion of the first pattern part with the second area to the second area.