A fusing apparatus and method for an image forming apparatus is disclosed. The apparatus and method comprise a heating roller rotatably mounted in a support frame, a pressing roller for rotating in contact with the heating roller, and defining a predetermined nip area by contact with the heating roller, a hinge bracket mounted in the support frame, and supporting either the pressing roller or the heating roller so that either roller rotates in contact with the other roller, first and second elastic members facing each other with the hinge bracket interposed therebetween, and elastically pushing the hinge bracket respectively, and a guide member for guiding movement of the hinge bracket while supporting the respective first and second elastic members, wherein the first and the second elastic members compress and expand reciprocally.