A high-definition display device is provided. A display device with low power consumption is provided. A highly reliable display device is provided. The display device includes a first transistor and a display element electrically connected to the first transistor. The first transistor includes a first oxide, a second oxide, a first conductor, a second conductor, a third conductor, a first insulator, and a second insulator. The first conductor and the second conductor are positioned over the first oxide to be apart from each other. The first insulator is positioned over the first conductor and the second conductor and includes an opening. The opening overlaps with a portion between the first conductor and the second conductor. The third conductor is positioned in the opening. The second insulator is positioned between the third conductor, and the first oxide, the first conductor, the second conductor, and the first insulator. The second oxide is positioned between the second insulator, and the first oxide, the first conductor, the second conductor, and the first insulator.