A sliding device includes a first sliding body and a second sliding body. A first sliding face that is a surface of the first sliding body and a second sliding face that is a surface of the second sliding body slide against each other in a hydrogen atmosphere. The first sliding body includes a first solid lubricant film forming the first sliding face. The second sliding body includes a second solid lubricant film forming the second sliding face. The first solid lubricant film is made of a material having an amorphous structure. The second solid lubricant film is made of a material having a layered structure.