Heater device

A heater device, comprising:

• a heat generating part configured to generate heat when energized;
• a detection unit configured to detect whether or not a distance between an object around the heat generating part and the heat generating part is equal to or less than a lower limit value of a first detection distance with a first detection sensitivity, and whether or not the distance between the object around the heat generating part and the heat generating part is equal to or less than a lower limit value of a second detection distance shorter than the first detection distance with a second detection sensitivity that is less sensitive than the first detection sensitivity;
• and
• a substrate on which the heat generating part, a receiving electrode, and a transmitting electrode are formed, wherein
• the heat generating part, the receiving electrode, and the transmitting electrode are formed on the same surface of the substrate,
• the transmitting electrode has a main wire portion and a plurality of branch-shaped portions that branch out and extend from the main wire portion,
• the transmitting electrode is disposed between a first receiving electrode and a second receiving electrode with a predetermined distance therebetween, and
• a distance between a plate-shaped portion of the first receiving electrode and a branch-shaped portion of the transmitting electrode facing the plate-shaped portion is shorter than a distance between a plate-shaped portion of the second receiving electrode and the branch-shaped portion of the transmitting electrode facing the plate-shaped portion.