PURPOSE: To provide a lunch box heating system capable of preventing a microwave oven from being used for another use by using the microwave oven only at the time of heating a lunch box sold from an automatic vending machine.

CONSTITUTION: An automatic vending machine 1 housing plural lunch boxes and one or plural microwave ovens 3 to 5 arranged at the side of the automatic vending machine 1 are electrically connected to each other, and an article detection sensor 14 is arranged at a lunch box exhibiting shelf arranged inside of the automatic vending machine 1 and at a path to an article take-out port 12 installed to the automatic vending machine 1. Thus, the lunch box falling to the article take-out port 12 from the exhibiting shelf is detected by the detection sensor 14 and when the sensor 14 is actuated, the microwave ovens 3 to 5 can be actuated.