1. A translation support device for supporting a process of translating an original sentence in a language into another language, comprising: a partial expression setting unit for setting a character string contained in an original sentence as a first original sentence partial expression; a dummy head setting unit for setting a character string representing the first original sentence partial expression as a first original sentence dummy head; an original sentence replacement unit for generating a first original skeleton sentence by replacing the first original sentence partial expression in the original sentence with the first original sentence dummy head; a translated sentence obtaining unit for obtaining a first translated skeleton sentence which is a translation of the first original skeleton sentence and a first translated partial expression which is a translation of the first original sentence partial expression; and a translated sentence replacement unit for generating a translation of the original sentence by replacing a first translation dummy head which is a translation of the first original sentence dummy head in the first translated skeleton sentence with the first translated partial expression.