There is provided a reconfigurable semiconductor device including a plurality of circuit blocks each including a reconfigurable logic unit, and an analog circuit configured to convert an analog signal from the outside into a digital signal to output the digital signal to the reconfigurable logic unit, and convert a digital signal outputted from the reconfigurable logic unit into an analog signal to output the analog signal to the outside. The circuit block has a rectangular shape, is connected to the two adjacent circuit blocks from one side with a plurality of analog lines, and is connected to the other two adjacent circuit blocks from the other side on a side opposite to the one side with a plurality of analog lines.