Electric heating device and manufacturing method thereof

An electric heating device, comprising:

• a heating unit having a heating element which is formed in an elongated shape and is configured to generate heat by current flow therethrough;
• a casing member provided outside the heating unit;
• and
• a fin member provided in contact with the casing member, and configured to radiate the heat generated in the heating unit into the atmosphere,
• wherein the casing member includes a pair of sandwiching plates configured to hold a constituent of the heating unit having the heating element from both sides of the constituent in a sandwiching manner;
• the fin member is brazed onto a front surface of each of the pair of sandwiching plates, a rear surface of each of the pair of sandwiching plates being a surface by which the constituent is held;
• and
• an engaging mechanism is provided to engage end edges of the respective sandwiching plates with each other while applying a load onto the sandwiching plates in a direction sandwiching the constituent.