A base station device includes: a converting unit that converts a transmission signal with a multi-bit quantization bit rate to a signal with a quantization bit rate smaller than the quantization bit rate of the transmission signal; a first amplifier that amplifies the signal; an extracting unit that extracts a noise component generated in the signal due to the conversion; a second amplifier that amplifies the noise component; a combining unit that combines the signal amplified by the first amplifier with the noise component amplified by the second amplifier to remove a noise component included in the amplified signal; and an adding unit that adds, based on an error between the signal from which the noise component has been removed and the transmission signal, distortion to the signal that is input to the first amplifier or the noise component that is input to the second amplifier.