A translation device includes: a controller that extracts a proper noun candidate from an original sentence, generates a translation word of the proper noun candidate in a second language, generates a second translated sentence by translating the original sentence into the second language based on the proper noun candidate and the translation word of the proper noun candidate, and generates a second reverse-translated sentence by translating the second translated sentence into the first language based on the proper noun candidate and the translation word of the proper noun candidate; a display that displays the first reverse-translated sentence and the second reverse-translated sentence; and an operation unit that receives a user operation of selecting one of the first reverse-translated sentence and the second reverse-translated sentence. The controller displays one of the first translated sentence and the second translated sentence on the display as a translated sentence of the original sentence according to the selection of the user.