A relay device includes: a first contact and a second contact; a driving mechanism; a first conductor; a second conductor; and a static relay and an electric heating element. The driving mechanism is configured to cause the first contact and the second contact to be close to each other or separated from each other. The first conductor is electrically coupled to the first contact. The second conductor is electrically coupled to the second contact. The static relay and an electric heating element are coupled between the first conductor and the second conductor. The electric heating element is disposed to allow heating of one or both of the first contact and the second contact.