To obtain a radio communication terminal device which is capable of suppressing the deterioration of demodulation performance in an uplink out-of-synchronism state.

A radio communication terminal device includes a feedback information generating section 5 for generating feedback information from a transmission line estimate value; an antenna weight estimating section 7 for generating the result of antenna weight estimation by estimating an antenna weight of a radio base station from a received signal; an uplink synchronous state determination section 8 for determining whether the uplink synchronous state of a transmission line is an out-of-synchronism state or a synchronized state from the feedback information and the result of antenna weight estimation; a phase correction amount determining section 9 for determining a phase rotation amount as a correction amount of the transmission line estimate value from the feedback information, the result of antenna weight estimation and the uplink synchronous state; and a transmission line estimate correcting section 10 for correcting the transmission estimate value in accordance with the phase rotation amount.