The purpose of this paper is to consider a concept of justice on H.D. Thoreau's "Civil Disobedience." "Civil Disobedience" is read by many people all over the world, and has had a great impact on them. John Rawls, an American philosopher, thought about justice and wrote about "civil disobedience" in his book, A Theory of Justice. To understand Thoreau's concept of justice, I examine by comparing Thoreau's "civil disobedience" and Rawls' "civil disobedience" in this paper.