A MIMO receiver apparatus and a MIMO transmitter apparatus capable of reducing the feedback information amount to reduce the system traffics. A wireless communication apparatus (100) at a receiving end comprises a reception level determining part (130) that uses pilot signals transmitted from the antennas of a wireless communication apparatus (200) at a transmitting end to determine a communication quality (e.g., SINR) for each of the antennas (corresponding to substreams); a transmitting part (170) that transmits feedback information based on the communication qualities to the transmitting end; a relative value calculating part (150) that calculates, from both the communication quality of a reference antenna (corresponding to a reference substream) selected from the antennas at the transmitting end and the communication qualities of the antennas other than the reference antenna, relative values of the other antennas relative to the reference antenna; and a feedback information generating part (160) that generates the feedback information from both the absolute value of the communication quality of the reference antenna and the forgoing relative values of the communication qualities.