A display device includes a first electrode, a first insulating layer having a first top surface and a first side wall, the first side wall having a closed shape and being exposed to a first opening reaching the first electrode, an oxide semiconductor layer on the first side wall, the oxide semiconductor layer including a first portion and a second portion, the first portion being connected with the first electrode, a gate electrode facing the oxide semiconductor layer, a gate insulating layer between the oxide semiconductor layer and the gate electrode, a first transparent conductive layer above the first top surface, the first transparent conductive layer being connected with the second portion, and a second transparent conductive layer connected with the first transparent conductive layer, the second transparent conductive layer forming the same layer with the first transparent conductive layer.