An image sensor includes a pixel array including pixel blocks, each comprising a light receiving section including unit pixels sharing a floating diffusion; and a driving section including a reset transistor and a driver transistor, wherein the pixel blocks include a first pixel block and a second pixel block which are adjacent to each other in a first direction, and a third pixel block and a fourth pixel block which are adjacent to the first pixel block and the second pixel block, respectively, in a second direction, and wherein the reset transistor of the first pixel block and the reset transistor of the second pixel block share a drain between the reset transistors, and the driver transistor of the third pixel block and the driver transistor of the fourth pixel block share a drain between the driver transistors.