A support structure of the present invention includes a fixation member directly or indirectly heated, a supported object supported by the fixation member, and a sliding member provided on an outer periphery of the fixation member, the sliding member being slidable in a longitudinal direction of the fixation member. In the support structure, one fixation part of the supported object is fixed to the fixation member and another fixation part of the supported object is fixed to the sliding member. By this structure, it is possible to avoid concentration of stress and to surely support the supported object to the thermally expanding fixation member.