A radio transmission apparatus performs peak suppression processing in the two stages of pre-peak suppression processing and post-peak suppression processing. The gain adjustment processing of transmission power is performed in the two stages of coarse gain adjustment processing, prior to the pre-peak suppression processing, and fine gain adjustment processing prior to the post-peak suppression processing. The fine gain adjustment processing has a smaller adjustment step width than the coarse gain adjustment processing, and can adjust the transmission power in response to a small variation of the transmission power. In the pre-peak suppression processing, a peak suppression value corresponding to the gain set by the coarse gain adjustment processing is set on the basis of each value being preset in a table for each transmission power value. In the post-peak suppression processing, the peak suppression value corresponding to the gain modified by the fine gain adjustment processing is obtained by calculation.