PORTABLE RADIO DEVICE

PROBLEM TO BE SOLVED: To provide a portable radio device capable of miniaturizing a device main body and reducing costs even while reducing antenna performance degradation due to electromagnetic coupling generated by adjacent arrangement of two antenna elements.SOLUTION: A slit 24 is formed in a ground pattern between a second feeding part 21 and a second connection part 23 of a second circuit board 20. Thus, by an inductor L2 corresponding to a route length of the slit 24 and a capacitor C3 generated between the ground pattern of a first circuit board 10 and the ground pattern of the second circuit board 20, the effect of arranging a high frequency filter between the ground patterns is obtained. By the filter effect, isolation between the ground pattern of the first circuit board 10 and the ground pattern of the second circuit board 20 is secured, and the antenna performance degradation due to the electromagnetic coupling of a first antenna element 12 and a second antenna element 22 is suppressed.