A portable wireless device having a plurality of wireless sections capable of diversity operation which can reduce the size, thickness, weight and manufacturing cost by reducing the number of antennas. The portable wireless device (100) comprises first through third main antenna devices (101-103), first through third wireless sections (111-113) connected, respectively, with the first through third main antenna devices (101-103) and capable of diversity operation, a sub-antenna device (121) for diversity operation connected with any one of the first through third wireless sections (111-113) at the time of diversity operation, and a section (120) for switching connection of the sub-antenna device (121) with any one of the first through third wireless sections (111-113) at the time of diversity operation.