Heating floor panel unit and floor structure of railcar

A heating floor structure of a railcar, the heating floor structure comprising:

• a plurality of heating floor panel units arranged with a space therebetween;
• a plurality of fastening members fixing the plurality of heating floor panel units to a carbody;
• and
• a filler filling the space, wherein:
• each of the plurality of heating floor panel units comprises
• a heater-equipped floor panel,
• a first flange horizontally projecting from one of opposite ends of the heater-equipped floor panel and fixed to the carbody by a first fastening member of the plurality of fastening members,
• a second flange horizontally projecting from the other of the opposite ends of the heater-equipped floor panel and fixed to the carbody by a second fastening member of the plurality of fastening members, and
• a filler receiver;
• the first flange and the second flange are located at such a height that upper ends of the first fastening member and the second fastening member are located below an upper surface of the heater-equipped floor panel;
• the filler receiver has elasticity, is press-fit in the space, and is located above the upper ends of the first fastening member and the second fastening member;
• and
• the first flange of one of the plurality of heating floor panel units is located at such a position that the first flange of the one heating floor panel unit, as viewed from above, does not overlap the second flange of another heating floor panel unit adjacent to the one heating floor panel unit.