Abstract: A food heating warmer includes a placing section divided into a plurality of divided sub-sections in a warming compartment so that food is placed on the placing section, a plurality of constant temperature heating units located so as to correspond to the divided sub-sections of the placing section, each unit including a heater for heating the divided sub-section, a divided section temperature sensor detecting a temperature in each divided sub-section, and a switching element turning the heater on and off according to the temperature detected by the divided sub-section temperature sensor, a failure detecting unit which detects failures of the constant temperature heating units provided for the respective divided sub-sections of the placing section, and a notifying unit which specifies and notifies the constant temperature. heating unit for which failure has been detected by the failure detecting unit.