| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device in which a section becoming high in temp., and an extent of the high temp. thereof can be easily confirmed. SOLUTION: In this image forming device provided with a heat roller 102 fixing the image formed on a sheet material on this sheet material, a reversible thermal change body whose color, characters or other displays are changed reversibly according to the temp. is affixed on at least one of members such as a fixation front guide 101, guides 107 and 108 or the like which are heated by the heat roller 102.
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