Folding mobile phone

A folding mobile phone is provided that improves the antenna characteristics of both of a main antenna and a sub-antenna. The folding mobile phone comprises at least an upper housing 1 , a lower housing 2 , a hinge unit 3 , a main antenna 4 located in the vicinity of the hinge unit 3 of the lower housing 2 , a sub-antenna 5 located at the lower end of the lower housing 2 , and a control unit for selecting an antenna to be used, the folding mobile phone comprising: an upper-and-lower-connections switching circuit 10 for connecting to a lower circuit board 7 ; and an upper-and-lower-boards connecting means 9 for connecting an upper circuit board 6 with the upper-and-lower-connections switching circuit 10 , wherein, at the upper-and-lower-connections switching circuit 10 , an electrical connection state between the upper circuit board 6 and the lower circuit board 7 is switched by turning the PIN diode on and off based on the antenna selection signal from the control unit. This provides an appropriate connection state for the selected antenna and thus improves the antenna characteristics of both antennas.