Heat exchanger and water heating device including the same

A heat exchanger, comprising:

• a case which has a first side wall that stands upright in a vertical height direction and to which a heating medium is supplied inside;
• and
• a plurality of serpentine heat transfer tubes for heating hot water, in which a plurality of straight tube bodies that extend in a direction intersecting the vertical height direction and are arranged at intervals in the vertical height direction are connected in a series via a plurality of connecting tube bodies, in the case,
• wherein the plurality of heat transfer tubes are arranged in a width direction of the case and housed,
• two end portions of each of the heat transfer tubes in a longitudinal direction are joined to the first side wall via a brazing portion, and the heat transfer tubes are respectively supported by the first side wall, and
• the heat exchanger further comprises a plurality of heat transfer tube support portions which are provided on the first side wall and opposingly contact or opposingly approach lower surface portions of the plurality of connecting tube bodies for supporting the plurality of connecting tube bodies, located near the first side wall, of the plurality of heat transfer tubes so as to prevent the plurality of connecting tube bodies located near the first side wall from descending below a first predetermined height.