A radio base station apparatus according to the invention includes an information monitoring section 2, and transmitter sections 11, 12 to 1n. Each of the transmitter sections 11 to in includes a delay control section 3, a data control section 4, a delay adjustment section 5, and an RF section 6. The information monitoring section 2 monitors the operation status of the data control section of each of the transmitter sections 11 to 1n. The information monitoring section 2 controls the data control section 4 according to the operation status monitored. The data control section 4 generates a multiplexed signal of a spread delay adjustment signal and a spread main signal. The multiplexed signal goes through the delay adjustment section and RF section, and is outputted via an antenna element. At the same time, the delay control section 3 compares the signal obtained by multiplexing the delay adjustment signal in the data control section 4 with a transmitting signal detected from the RF section to thereby calculate a transmission delay time.