A left shift tri-state buffer and a right shift tri-state buffer are provided in each of a plurality of barrel-shifter unit circuits which constitute a barrel-shifter, wherein a left or right shift control signal supplied to a left and right shift input terminal enables either of them. As a result, the left or right shift control signal switches between data transfer route from an input terminal to the input end i/o terminal and that from the input terminal to the output end i/o terminal so as to set a left shift or a right shift. It is also possible to shift input data by desired bits which are set by supplying address signals to address terminals to set the shifting amount.