Some people assumse that the essence of happiness reside in wealth and moneter. So, they fight to get according them opinion. There are other opinion that the element of happiness detectable in perfection of body. And they opinion that the happiness beside in position of office, glory and popularity. Like that about the justic, the justice is purpose, and the law as way to achieve the purpose of justice. In fact, the concept or value of justice often influence element the subjectivity of human, until the justice only can experienced by special human. In problem the happiness dan justice, there is scientist of islamic philosophy which try to justified about the happiness and justice. So, the researcher has questions which about the happiness and justice. 1) How is the concept of happiness and justice according Ibn Miskawaih, and 2) How is the relevance between happiness and justice?
Methodologically, this research is included as a qualitative research, where collecting data through library research. The researcher has a conclusion from his research, that the happiness according Ibn Miskawaih, there are three happiness; happiness because perfection of body, happiness because wealth and happines of soul. The true happiness is when the human remember to God, so they will be feel the happiness of soul. And the justice according Ibn Miskawaih is justice when the human doing fair to other human indifferent dan justice to Allah by the way to pray and pure of soul. The happiness and justice has relevance in the human life because the purpose of some goodness is happiness and justice is one of goodness.