Abstract: In the n-bit barrel shifter circuit having a rotation function, the inputs of a bidirectional barrel shifter are connected with a rightward shift change device and a leftward shift change device for controlling rightward and leftward shifting in accordance with the number of bits to be shifted up to (n-1), respectively, and a bit shift control signal capable of controlling shifting of bits of {(an integer part of n/2)+1} bits is inputted to the bidirectional barrel shifter. Therefore, the number of elements required in the barrel shifter circuit can be greatly reduced so that the area occupied by them is reduced. Additionally, the load capacitance attendant to each of the output lines of the barrel shifter can be greatly reduced.