The present invention provides a wireless communication apparatus that allows miniaturization of the wireless communication apparatus as a whole and improvement of characteristics of an antenna device. A notch portion is formed in a shield case formed of a conductive material that covers a radio-frequency wireless communication circuit provided on a printed wiring board so as to house the radio-frequency wireless communication circuit within the shield case. By feeding power to the notch portion, the shield case is operated as a slot antenna. At the same time, the shield case blocks undesired electromagnetic waves emitted from the radio-frequency wireless communication circuit. Alternatively, a notch antenna is formed by opening one end of the notch portion formed in the shield case. By thus making the shield case function as electromagnetic wave shielding member and also function as the slot antenna or the notch antenna, the wireless communication apparatus as a whole is miniaturized.