1. A translation device for performing translation into a set translation language, the translation device comprising: an input device for inputting an input sentence, the input device including a microphone; a translation language setting processor for (i) regularly determining whether a change in a position of the translation device has occurred and (ii) when a change in the position of the translation device is determined, setting the translation language from among used languages of speakers near the translation device based on located language information and position information of the translation device; and an output device for outputting an output sentence obtained by translating the input sentence into the translation language set by the translation language setting processor, the output device including a speaker, wherein the located language information includes a predetermined location of each of a plurality of speakers and a used language of the each of the plurality of speakers.