Abstract: A toilet-flushing control apparatus comprising a detector, a delay circuit, a judging circuit, a first timer, a second timer, and a flush valve. The detector detects that a person is using a toilet, and outputs a signal. This signal is input to the delay circuit. Upon lapse of a predetermined time after receiving this signal, the delay circuit outputs a signal. The output signal of the delay circuit is supplied to the judging circuit. When the output signal of the detector lasts shorter than a reference time, the judging circuit determines that the toilet user has urinated. Conversely, when this signal lasts for the reference time or a longer time, the judging circuit determines that the toilet user has defecated. In the first case, the first timer is operated, and the flush valve opens for the time set to the first timer, thereby flushing the toilet. In the second case, the second timer is operated, and the flush valve opens for the time set to the second timer, thus flushing the toilet.