The present invention relates to a roller mounting structure of rotating ring component of microwave oven. It is characterized by that on the periphery of component body of rotating ring component of rotary disk for supporting and guiding to place foods a mounting fastener whose diameter can be constricted when it is acted by external force and can be restored into the original form by means of its self-body elasticity is formed when said external force is removed. Besides, a fixed stop dog is formed on one side of external cylindrical surface of mounting fastener, and a fixed stepped hole whose diameter is small than outside diameter of the fixed stop dog is formed on one side of internal cylindrical surface of roller with internal diameter correspondent to outside diameter of mounting fastener. Said structure can make the roller be easily mounted on the fixing fastener and can protect the roller from damage. |