Disclosed is a transmission apparatus, a radio communication apparatus, and a transmission method for making it possible to obtain stable characteristics by controlling the difference of time between an amplitude signal and a phase signal to an optimal point, without depending on a modulated signal nor making the circuit size larger. A multiplier (170) generates, in a pseudo manner, a digital modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on a modulated signal that is generated by an amplitude modulator (140), by multiplying a digital amplitude signal that is obtained by performing analog to digital conversion on an amplitude signal by a digital angle modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on an angle modulated signal. Distortion calculation section (180) calculates distortion of the digital modulated signal, control section (190) controls delay time based on the distortion of the digital modulated signal, and delay adjustment section (130) adjusts delay time until the amplitude signal is input to amplitude modulator (140), or delay time until the angle modulated signal is input to amplitude modulator (140).