Disclosed is an image sensor including first to fourth, fifth to eighth, ninth to 12th and 13th to 16th unit pixel circuits, a first readout line connected to the first and ninth unit pixel circuits, a second readout line connected to the fifth and 13th unit pixel circuits, a third readout line connected to the second and 10th unit pixel circuits, a fourth readout line connected to the sixth and 14th unit pixel circuits, a fifth readout line connected to the third and 11th unit pixel circuits, a sixth readout line connected to the seventh and 15th unit pixel circuits, a seventh readout line connected to the fourth and 12th unit pixel circuits, an eighth readout line connected to the eighth and 16th unit pixel circuits, first to fourth readout circuits, and a path selector connecting the unit pixel circuits to the readout circuits via the readout lines.