An active array antenna device comprising: M (M≧2) receiving filters (7-1 to 7-n) configured to allow part of received signals received by M antenna elements or antenna sub-arrays to pass therethrough, the part being signals within a certain band; M low noise amplifiers (8-1 to 8-n) configured to amplify M received signals from the M receiving filters (7-1 to 7-n); M distributors (9-1 to 9-n) each configured to distribute a corresponding one of the M amplified signals amplified by the M low noise amplifiers (8-1 to 8-n) into N (N≧2) distributed signals; M sets of N phase shifters (10a-1 to 10a-n, 10b-1 to 10b-n), each set provided for the corresponding one of the distributors (9-1 to 9-n) and configured to shift phases of the N distributed signals distributed by the distributor (9-1 to 9-n); M sets of N attenuators (11a-1 to 11a-n), each set configured to attenuate N phase-shift signals from the N phase shifters (10a-1 to 10a-n, 10b-1 to 10b-n); N beam synthesis circuits (12-1, 12-2) provided respectively for M sets of the N attenuators (11a-1 to 11a-n), and each configured to synthesize a beam by adding up attenuator outputs that correspond to the M distributors (9-1 to 9-n) and are outputted by the corresponding set of the M attenuators (11a-1 to 11a-n); a plurality of heat insulating containers configured to accommodate the low noise amplifiers (8-1 to 8-n) and the receiving filters (7-1 to 7-n) formed of a superconductor material; and a cooler configured to cool the receiving filters (7-1 to 7-n) and the low noise amplifiers (8-1 to 8-n) accommodated in the heat insulating containers to make the receiving filters (7-1 to 7-n) in a superconducting state; and a cooling plate accommodated in the heat insulating containers, and placed to cool the receiving filters (7-1 to 7-n) and the low noise amplifiers (8-1 to 8-n), the cooling plate provided such that it is cooled by the cooler, wherein N and M are integers superior or equal to 2, characterized in that all or some pairs of the M receiving filters (7-1 to 7-n) and the M low noise amplifiers (8-1 to 8-n), are divided into groups including two or more pairs and are accommodated group by group in a plurality of the heat insulating containers, wherein each pair comprises a receiving filter (7-1 to 7-n) and a low noise amplifier (8-1 to 8-n) forming a received signal to be inputted to the same distributor (9-1 to 9-n). M (M≧2) receiving filters (7-1 to 7-n) configured to allow part of received signals received by M antenna elements or antenna sub-arrays to pass therethrough, the part being signals within a certain band; M low noise amplifiers (8-1 to 8-n) configured to amplify M received signals from the M receiving filters (7-1 to 7-n); M distributors (9-1 to 9-n) each configured to distribute a corresponding one of the M amplified signals amplified by the M low noise amplifiers (8-1 to 8-n) into N (N≧2) distributed signals; M sets of N phase shifters (10a-1 to 10a-n, 10b-1 to 10b-n), each set provided for the corresponding one of the distributors (9-1 to 9-n) and configured to shift phases of the N distributed signals distributed by the distributor (9-1 to 9-n); M sets of N attenuators (11a-1 to 11a-n), each set configured to attenuate N phase-shift signals from the N phase shifters (10a-1 to 10a-n, 10b-1 to 10b-n); N beam synthesis circuits (12-1, 12-2) provided respectively for M sets of the N attenuators (11a-1 to 11a-n), and each configured to synthesize a beam by adding up attenuator outputs that correspond to the M distributors (9-1 to 9-n) and are outputted by the corresponding set of the M attenuators (11a-1 to 11a-n); a plurality of heat insulating containers configured to accommodate the low noise amplifiers (8-1 to 8-n) and the receiving filters (7-1 to 7-n) formed of a superconductor material; and a cooler configured to cool the receiving filters (7-1 to 7-n) and the low noise amplifiers (8-1 to 8-n) accommodated in the heat insulating containers to make the receiving filters (7-1 to 7-n) in a superconducting state; and a cooling plate accommodated in the heat insulating containers, and placed to cool the receiving filters (7-1 to 7-n) and the low noise amplifiers (8-1 to 8-n), the cooling plate provided such that it is cooled by the cooler, wherein N and M are integers superior or equal to 2, characterized in that all or some pairs of the M receiving filters (7-1 to 7-n) and the M low noise amplifiers (8-1 to 8-n), are divided into groups including two or more pairs and are accommodated group by group in a plurality of the heat insulating containers, wherein each pair comprises a receiving filter (7-1 to 7-n) and a low noise amplifier (8-1 to 8-n) forming a received signal to be inputted to the same distributor (9-1 to 9-n).