Euthanasia associated with life span is one of the social issues which should be scrutinized and referred with care. Today, most people claim that we have to address the problem carefully because they know one of the obstacles to enjoying peace of mind is the fear of death. Most of all, the reason why the euthanasia is the general question on controversy is that euthanasia means “comfortable death", which makes us think of the meaning of the word 'comfortable' profoundly.