Heating eraser for removing thermally changeable ink

A heating eraser for removing thermally changeable ink comprising a heating eraser unit that removes or changes a color by instantaneously applying heat at 50 to 65° C. as a color changing temperature range of a phase transition material selectively along a handwriting written or drawn by a writing instrument using the thermally changeable ink containing thermally changeable fine particles of 10 wt % to 70 wt % including a core portion containing the transition material including a phenol-based compound containing an aliphatic functional group having carbon atoms of 6 or more and a shell layer covering the core portion and made of a polymer resin on a substrate, wherein the heating eraser unit is integrally coupled with the writing instrument, separated from the writing instrument, has the writing instrument form, or detachably coupled with at least a part of the writing instrument.