A functional block is divided into a plurality of regions. In each region, a clock main line extending along a first direction, a clock branch line group including a plurality of clock branch lines extending along a second direction perpendicular to the first direction and electrically connected to the clock main line, a clock driving cell electrically connected to the clock main line and a clock synchronous cell group including a plurality of clock synchronous cells electrically connected to the clock main line or the clock branch line group are provided. The clock branch line groups of the respective regions are electrically separated from each other, and the clock driving cell singly drives the clock main line connected thereto and the clock branch line group connected to the clock main line.