To provide a compact antenna whose outer dimension is not more than 1/10 of the wavelength with multi-polarization and multi-frequency radiation.

A conductor or a ribbon-shaped conductor is wound spirally around a cylindrical thick bobbin with the lower part of the cylinder as a start point until the upper edge of the cylinder; and the conductor is folded inside the cylinder and pulled down obliquely along the inner wall of the cylinder to the lower edge until a point, deviating from the position where the winding is started only by 1/8 of the inner periphery of the cylinder, folded again at the lower part of the cylinder, pulled out toward the outer wall of the cylinder, and wound once along the outer periphery. As a result, it is possible to provide a compact antenna with spiral coils wound 8 times on its full periphery.