An IC card reader/writer having a body which includes an IC insertion slot and an operation display section. The body is separable into an upper cover and a lower portion. The upper cover and the lower portion are displaced from each other to form a step on the side of the body formed with the IC card insertion slot. Further, a rack recessed from the step is formed on the portion of the body having the IC card insertion slot. Furthermore, the surface of the upper cover is curved upward in the direction away from the IC card insertion slot in such a manner as to increase the thickness progressively toward the side of the body far from the IC card insertion slot, and a display section is located on the slope of the curved portion. The operating area of the IC card reader/writer has function keys.