To provide an on-board diversity receiver and its receiving method capable of removing image/audio noises caused by wipers passing across an antenna, and preventing information receiving quality from lowering when the wipers are not turned on.

An antenna control unit 13 switches to select the antenna of a highest receiving level specified by a level detection unit 8 from multiple film antennas 1 to 4 mounted on a windshield 16, when the wipers are not turned on by a wiper driving unit 11. When the wipers are turned on by the wiper driving unit 11, the antenna control unit 13 selects the antenna (a film antenna 1) which is mounted out of working ranges of the wipers 14 and 15.