A water leakage detection apparatus includes a pressure sensor, a detecting unit, and an actuator. The pressure sensor is disposed in a water pipe. The detecting unit detects water leakage based on sensor signals from the pressure sensor. The actuator is controlled by the detecting unit, and opens and closes an electromagnetic valve that is disposed in the water pipe. The detecting unit samples the sensor signals in a state in which the water pipe is closed by the electromagnetic valve, and performs a water leakage determination for detecting water leakage based on the sampled sensor signals.