PURPOSE: To suppress deterioration in a radiation pattern and a gain by connecting a part around a middle part of a radiation element to ground to maximize an input impedance between a 1st radiation element and a shield of a radio equipment when viewing a point around a feeding point.

CONSTITUTION: A part around a middle part of a 1st radiation element 21 is connected to ground being a ground conductor 27 which is a ground means of a feeder 25 so as to maximize an input impedance between the 1st radiation element 21 and the ground conductor of the feeder 25 in the case of containing the 1st radiation element 21 in a radio equipment 20. Since a signal current from the grounding side of the feeder 25 is more concentrated onto other radiation elements 22, 23, a current flowing to the radio equipment 20 is suppressed and the effect of radiation when a human body approaches is improved. Even when the signal current from the ground side of the feeder 25 is concentrated on the other radiation elements 22, 23 and the current distribution of the radiation system is close to that of a balanced system, since a part between the radiation element and the shield 24 acts like a balance/unbalance converter, change in the radiation pattern and deterioration in the gain are suppressed.