A position detection device for a moving body, and the moving body having the position detection device

When either a first signal or a second signal is interrupted, it is difficult to maintain the accuracy of position detection in a technique in which input is switched to the other signal and positiondetection is continued. The position detection device is provided in a moving body; the position detection device detects, as the position of the moving body, a first position, which is an estimated position based on the first signal, and a second position, which is an estimated position based on the second signal, which position is an estimated position based on the effective one of the first signal and the second signal. The position detection device performs matching determination to determine whether or not the difference between a first trajectory, which is the trajectory of two or more first positions output during a certain period or a certain position range, and a second trajectory, which is the trajectory of two or more second positions output during a certain period or a certainposition range, is equal t