Heating rod and heater having same

A heating rod comprising:

• a ceramic substrate;
• a heat-radiating element disposed in the ceramic substrate;
• a first electrode terminal electrically connected to one end of the heat-radiating element;
• and
• a second electrode terminal electrically connected to an opposite end of the heat-radiating element,
• wherein a ratio of a thickness of the heat-radiating element to a thickness of the ceramic substrate is in a range of 1:2 to 1:50,
• wherein the heat-radiating element is convex alternately in a 1-1 direction and a 1-2 direction of the ceramic substrate, and
• wherein the 1-1 direction is from the heat-radiating element toward one surface of the ceramic substrate, and the 1-2 direction is from the heat-radiating element toward an opposite surface of the ceramic substrate.