An identification device comprising: M transmission antenna elements (31A to 31H) each of which transmits a first transmission signal to a predetermined area including a first living body, M being an integer greater than or equal to 1; characterized in that N receivers (30A to 30H) disposed surrounding the predetermined area, each of the N receivers including a reception antenna element and receiving a first reception signal using the reception antenna element during a predetermined period, N being an integer greater than or equal to 3, the first reception signal including a reflection signal obtained as a result of the first transmission signal being reflected by the first living body; a memory in which teacher signals are stored, the teacher signals being MxN second reception signals obtained as a result of the N receivers receiving, in advance, second reception signals including reflection signals obtained as a result of second transmission signals being transmitted from the M transmission antenna elements to a second living body and reflected by the second living body; and a circuit which calculates a plurality of correlation coefficients from the teacher signals and MxN first reception signals obtained as a result of each of the N receivers receiving the first reception signal, performs biometric authentication of the first living body according to whether or not a maximum value of the plurality of correlation coefficients calculated exceeds a threshold, and when the biometric authentication of the first living body is to be performed, identifies by a predetermined method the first living body and the second living body as identical. M transmission antenna elements (31A to 31H) each of which transmits a first transmission signal to a predetermined area including a first living body, M being an integer greater than or equal to 1; characterized in that N receivers (30A to 30H) disposed surrounding the predetermined area, each of the N receivers including a reception antenna element and receiving a first reception signal using the reception antenna element during a predetermined period, N being an integer greater than or equal to 3, the first reception signal including a reflection signal obtained as a result of the first transmission signal being reflected by the first living body; a memory in which teacher signals are stored, the teacher signals being MxN second reception signals obtained as a result of the N receivers receiving, in advance, second reception signals including reflection signals obtained as a result of second transmission signals being transmitted from the M transmission antenna elements to a second living body and reflected by the second living body; and a circuit which calculates a plurality of correlation coefficients from the teacher signals and MxN first reception signals obtained as a result of each of the N receivers receiving the first reception signal, performs biometric authentication of the first living body according to whether or not a maximum value of the plurality of correlation coefficients calculated exceeds a threshold, and when the biometric authentication of the first living body is to be performed, identifies by a predetermined method the first living body and the second living body as identical.