To provide a wastewater treatment apparatus equipped with a magnetic particle recovery device capable of separating magnetic particles of higher purity with less energy than ever before from magnetic flock produced from wastewater, particularly wastewater containing oily matter.

In the wastewater treatment apparatus 100 equipped with a magnetic flock removal device 10 for obtaining treated water in which the magnetic flock is removed from the wastewater and the magnetic particle recovery device 15 for separating the magnetic particles from the recovered magnetic flock, the magnetic particle recovery device 15 includes a hydrothermal treatment device 11 for hydrothermally treating the recovered magnetic flock, a specific gravity difference separation tank 20 for separating the component in the hydrothermally decomposed matter via the hydrothermal treatment into a heavy specific gravity component having heavier specific gravity and a light specific gravity component having lighter specific gravity by specific gravity difference, and a magnetic particle separator 26 for separating the magnetic particles using magnetism from the heavy specific gravity component separated via the specific gravity difference separation.