To miniaturize an equipment main body by integrating a touch pen with a part of an antenna.

An antenna main body 3 is freely turnably attached to a case 1 so as to adjust the reception sensitivity of this antenna and to easily detach an antenna cap 4. The antenna main body 3 is constituted of a conductor part 3a provided on an axial center and an outer jacket 3b composed of an insulation body for covering the conductor part 3a and is provided with an end part 3A fitted to the antenna cap 4. Since the conductor 3a is covered with the outer jacket 3b of the antenna 3 and the antenna 3 and the antenna cap 4 are completely separated, the performance of the antenna is not changed even when the antenna cap 4 is detached from the antenna 3. The antenna cap 4 is constituted of a hollow conical part 4A fitted to the end part 3A of the antenna 3 and a tip part 4B whose tip is narrowed for pressurizing the surface of a display/input operation part at the tip of the conical part 4A or the like.