The present invention provides a transfer-fixing device which saves energy and does not generate the fixing inferior image and an image forming device thereof. The transfer-fixing device comprises a transfer-fixing device 27 of the toner image T, a pressurizing component 68 which compression-joints with the transfer-fixing component 27 to form a retaining component that conveys the recording medium P, a heating component 67 for heating the transfer-fixing surface of the recording medium P conveyed to the retaining part, and a temperature equalizing component which equalizes the temperature distribution in width direction on the surface of the transfer-fixing component 27 passed through the retaining component. Afterwards, the heating component 67 heats the transfer-fixing surface before the temperature elevating of the back surface of the transfer-fixing surface of the recording medium P to lead to that the recording medium P is conveyed to the retaining part.