There is provided a radar device which detects targets by performing a signal processing procedure based on a frequency-modulated continuous wave and the reflected waves of the transmission wave from the targets. A signal processing unit is configured to periodically perform the signal processing procedure based on beat signals which are differential waves between the transmission wave and the reflected waves. A monitoring unit is configured to monitor each of processing states of processes which are sequentially performed in the signal processing procedure. A changing unit is configured to change a processing condition for the subsequent-stage processes of a process, according to the processing state of the process, if the monitoring unit detects that the process is in a high load state, from the processing states.