A fixing device includes a cap member mounted at an end portion of a fixing belt. The cap member has an outer cylindrical part that is fitted on an end portion of the fixing belt, an inner cylindrical part that is fitted into the end portion of the fixing belt, and a connection plate part that is positioned at an outer side of the axial direction from the end portion in the axial direction of the fixing belt and connects the inner cylindrical part and the outer cylindrical part. The fixing device further includes an electrode sheet that is provided between the inner cylindrical part and the fixing belt, and a plurality of vibrating bodies that are mounted at the electrode sheet so as to abut an inner peripheral surface of the fixing belt and are vibrated by receiving power through the electrode sheet.