A bed occupancy state detection method includes a load detection step for detecting loads applied to a head side right portion, a head side left portion, a foot side right portion, and a foot side left portion of a bed platform by a first to fourth load detection means, respectively, a judgment step for judging whether or not a prescribed judgment formula is satisfied based on load values W1, W2, W3, and W4 outputted form the first to fourth load detection means, and a first notification step for notifying information on a bed occupancy state of an object in cases where it is judged that a judgment formula is satisfied from a judgment result at the judgment step.
