An image sensor includes a first layer including a pixel array region having a plurality of pixels arranged in a plurality of row lines and a plurality of column lines; and a second layer including a row driver selecting at least a portion of the plurality of row lines, generating pixel control signals driving selected row lines, and outputting the pixel control signals to control signal lines, wherein the selected row lines share the control signal lines, at a branch point of the first layer, the selected row lines receive the pixel control signals from the control signal lines in common, and the pixel control signals simultaneously drive the selected row lines.