The disclosed technology provides an electrowetting display unit and an electrowetting display device. The electrowetting display unit comprises a polar fluid, a non-polar fluid that is colored, and separation walls for surrounding the polar fluid and the non-polar fluid; a medium layer located below the fluid chamber and in contact with the non-polar fluid or polar fluid in the fluid chamber; and an electrode located below the medium layer. Spaces are provided on the separation walls, have openings toward the medium layer, and function to completely or partially store the non-polar fluid when a voltage is applied between the polar fluid and the electrode. The electrowetting display device comprises the electrowetting display unit.