An antenna device to be loaded into an information apparatus has an antenna unit composed of antenna members which have a plurality of radio communication frequency bands, and which are divided into two of an element part having a flexural portion and a GND part, and a holding member composed of a member having non-conductivity, such as a resin member, to hold the respective antenna members so as to leave a constant gap g from the antenna members within a window area, the holding member being mounted so as to hang on an edge at the outside of a frame body of a liquid crystal display panel in an LCD housing of a PC.