A transparent display device includes a pixel region, a first transparent region and a second transparent region. The pixel region includes at least three sub-pixels arranged along a direction. The first transparent region and the second transparent region are disposed along the direction and the pixel region is disposed between the first transparent region and the second transparent region. The first transparent region has a first width in maximum along the direction. One of the at least three sub-pixels has a second width in maximum along the direction, and the first width is different from the second width.