An automotive wireless communication apparatus (10) provided with an in-vehicle reporting processor for reporting to a wireless device (20), upon establishing that the automotive wireless communication apparatus (10) is within the vehicle (100), information that makes it possible to establish that the wireless device (20) is in the vehicle, the wireless device (20) adjusting the transmission power so that the reception power level of a second wireless communication unit (11b) does not become excessively large. The second wireless communication unit (11b) is another wireless communication apparatus that is different from a first wireless communication unit (11a), which is a wireless communication apparatus that participates in the communication as the other party. The second wireless communication unit (11b) performs wireless communication within the vehicle (100) using a wireless communication method that uses the same frequency band.