To provide a direction detection device preventing a hardware scale from getting excessive, a direction detection method, and a direction detection program.

The direction detection device includes: antennas configured to receive a signal reflected by an object, the antennas being a plurality of systems having polarization characteristics different from each other; a determination unit configured to determine the polarization characteristics of the received signal; and an operation processing unit configured to select a detection range corresponding to the polarization characteristics which have been determined.