Japan is a developed country in East Asia. The development of Japan supported by their foreign policy in military field. Japan implemented Pacifism since the Second World War end. Because of pacifist system Japan cannot develop their military force including their military armament. Because of that, Japan allocate their budget in the developing of economic and industry. Because of that, Japan became a country that rapidly grows in economy. But in 2014 Japan Prime Minister Shinzo Abe push the reinterpretation of Article Nine that control the pacifist system. The reinterpretation by Shinzo Abe and cabinets is assigned without voting or Japan citizens Voice. So in this undergraduate thesis will be examine the decision making consideration about the domestic politics and international response toward the reinterpretation of Japan military constitution Article Nine. This Undergraduate thesis also examine Japan military change toward neighbor countries relation.