PROBLEM TO BE SOLVED: To provide a door opening/closing mechanism capable of reducing torque of a motor necessary for cancelling magnetization between a door and a housing.SOLUTION: A door opening/closing mechanism for a refrigerator includes: a motor M configured to output power for opening/closing the door; a power transmission mechanism 40 configured to transmit power of the motor M to a hinge by rotation of a plurality of drive gears 45; and an auxiliary mechanism 30 configured to generate auxiliary force for moving the door at a closed position toward an open direction. The door opening/closing mechanism is configured to generate the auxiliary force of the auxiliary mechanism 30 by power of the motor M, before transmitting the power of the motor M to the hinge Z through the power transmission mechanism 40.SELECTED DRAWING: Figure 34