Abstract: A wrist-mounted portable cellular telephone set has its constituent elements separated from each other. Indispensable ones of the elements are collected to form a portable section, which is mountable on a person's wrist. The remaining ones of the elements are collected to form an independent body. As a result, the wrist-mounted portable cellular telephone set is improved in design, comfortableness in wear, and in operability. The independent body forms a stationary section, which is provided with a character input means and separated from the portable section. The portable section is provided with all the function of a cellular phone other than those functions already provided in the stationary section. The wrist-mounted portable cellular telephone set is constructed of the stationary section and the portable section. A character input control signal is transmitted from a character input means of the stationary section to a display panel of the portable section.