To provide an image copying device which can process double closed- loop areas and performs high-quality image processing by preventing a gap and an overlap resulting from a difference in resolution between an image signal and a switching signal, with respect to a image copying device which has a function of detecting the position of a closed loop entered into a document and performing different image processes inside and outside the closed loop.

A delay circuit 230 decides the start point and end point of a closed loop from the position relation between the switching signal 503 and an outline signal 505 generated by an image processing control part 219 and an image area control circuit 214 to generate a switching signal having been corrected. An image processing unit 111 performs image processing according to the switching signal 511 having been corrected.