A semiconductor chip having a core region and an I/O region which surrounds the core region is provided with a plurality of external connection pads connected to I/O cells. The plurality of external connection pads include a first pad group comprised of the external connection pads connected to the same node, and a second pad group comprised of the external connection pads connected to respective different nodes. In first and second pad groups, the external connection pads are arranged in an X direction along an external side of the semiconductor chip, and a pad arrangement pitch in the first pad group is smaller than that in the second pad group.