A bias output apparatus includes: a plurality of voltage output circuits, each configured to output a bias voltage to be supplied to a load and a determination voltage generated based on the bias voltage; a determination circuit configured to output a binary determination signal based on the determination voltage output by each of the plurality of voltage output circuits; and a controller configured to control the plurality of voltage output circuits and determine whether or not the plurality of voltage output circuits are operating normally based on the determination signal output by the determination circuit. The controller is further configured to determine that the plurality of voltage output circuits are operating normally if an output pattern of the determination signal is a predetermined first pattern while the controller is controlling the plurality of voltage output circuits to output bias voltages in order.