Liquid heating device

A liquid heating device comprising:

• a container having an internal space, and an inlet and an outlet communicating with the internal space;
• three or more ceramic heaters which extend in a front-rear direction and of which distal-end portions are located in the internal space and base-end portions are located outside the container, the ceramic heaters each having a heat generation portion at the distal-end portion and a pair of heater terminals at the base-end portion;
• and
• a separator opposed to the container and having a retention portion surrounding at least a part of each heater terminal of the pairs of heater terminals, to restrict positions of the heater terminals, wherein
• in a process in which a liquid is introduced from the inlet and flows through the internal space to the outlet, the liquid is heated by the ceramic heaters,
• the ceramic heaters are arranged side by side with each other along the front-rear direction, and
• in a cross-section crossing the front-rear direction, centers of gravity of a plurality of the ceramic heaters are respectively located at vertices of a polygon, a first heater terminal which is one of the pair of heater terminals of each ceramic heater is located inside the polygon, and a second heater terminal which is another of the pair of heater terminals of each ceramic heater is located outside the polygon.