An adaptive antenna radio communication device comprising: an array antenna made up of a plurality of antenna elements (1-1,..., 1-Na) receiving high frequency signals that are transmitted by multi-carrier; demultiplexers (2-1,..., Na), each demultiplexer (2-k) demultiplexes the signal received by each antenna element (1-k) to a plurality of sub-carrier signals (f1-k,..., f4-k); Nd divided band direction estimating units (4-1,..., Nd) for estimating the direction-of-arrival of a radio wave by dividing the entire communication band being said multi-carrier transmitted into Nd bands, where Nd is 2 or more, each Nd divided band direction estimating unit (4-m) using more than one sub-carrier signal, which belongs to each divided band (3-m) and which is received by all the antenna elements, for estimating the direction-of-arrival of a radio wave; divided band array weight creating units (5-1,...Nd), each divided band array weight creating unit (5-m) creating a weight of a receive array having a directional beam in the direction of estimation by each Nd divided band direction estimating unit (4-m) for each divided band (3-m); sub-carrier directivity creating units (6-1,...,Nd), each sub-carrier directivity creating unit (6-m) creating a directivity by multiplication-combining the receive array weight created in each divided band (3-m) with the sub-carrier signal, which belongs to each divided band (3-m) and which is received by all the antenna elements; and a demodulating unit for demodulating data by using the output of said sub-carrier directivity creating unit, wherein each divided band direction estimating unit (4-m) comprises a pilot signal creating unit for creating a known pilot signal embedded in a sub-carrier signal, calculates pilot signal correlation values with the respective input sub-carrier signals using said known pilot signal, and estimates the direction-of-arrival based on the correlation values of the pilot signal correlation values calculated between the same sub-carrier signals received by different antenna elements. an array antenna made up of a plurality of antenna elements (1-1,..., 1-Na) receiving high frequency signals that are transmitted by multi-carrier; demultiplexers (2-1,..., Na), each demultiplexer (2-k) demultiplexes the signal received by each antenna element (1-k) to a plurality of sub-carrier signals (f1-k,..., f4-k); Nd divided band direction estimating units (4-1,..., Nd) for estimating the direction-of-arrival of a radio wave by dividing the entire communication band being said multi-carrier transmitted into Nd bands, where Nd is 2 or more, each Nd divided band direction estimating unit (4-m) using more than one sub-carrier signal, which belongs to each divided band (3-m) and which is received by all the antenna elements, for estimating the direction-of-arrival of a radio wave; divided band array weight creating units (5-1,...Nd), each divided band array weight creating unit (5-m) creating a weight of a receive array having a directional beam in the direction of estimation by each Nd divided band direction estimating unit (4-m) for each divided band (3-m); sub-carrier directivity creating units (6-1,...,Nd), each sub-carrier directivity creating unit (6-m) creating a directivity by multiplication-combining the receive array weight created in each divided band (3-m) with the sub-carrier signal, which belongs to each divided band (3-m) and which is received by all the antenna elements; and a demodulating unit for demodulating data by using the output of said sub-carrier directivity creating unit, wherein each divided band direction estimating unit (4-m) comprises a pilot signal creating unit for creating a known pilot signal embedded in a sub-carrier signal, calculates pilot signal correlation values with the respective input sub-carrier signals using said known pilot signal, and estimates the direction-of-arrival based on the correlation values of the pilot signal correlation values calculated between the same sub-carrier signals received by different antenna elements.