Heater

A heater comprising:

• a base having a rod shape or a cylindrical shape;
• a heat element embedded in the base;
• a cylindrical body including
• a first cylinder including a first end that is open,
• a second cylinder including a second end that is open, the second cylinder being continuous with the first cylinder and having a smaller outer diameter than the first cylinder,
• at least one ridge located on an outer circumferential surface of the second cylinder and extending in an axial direction of the second cylinder, the cylindrical body receiving the base with an end of the base placed and fixed through the first end, and
• wherein the first cylinder, the second cylinder, and the at least one ridge are being continuous with one another;
• and
• a metal fixture being in contact with the at least one ridge and including a first hole receiving the cylindrical body, an inner circumferential surface of the first hole surrounding the second cylinder.