Act Governing the Choice of Law in Civil Matters Involving Foreign Elements Article 5
Where reference is made by this Act to the national law of a party, but the national law of the party differs by reference to sub-national region or another factor, the applicable law is the law as indicated by the rules on choice of law of that national law; if the rules on choice of law of that national law are unclear, the law with which the party is most closely connected, whether by region or by the other factor, is applied.
中文原文 涉外民事法律適用法第5條
依本法適用當事人本國法時，如其國內法律因地域或其他因素有不同者，依該國關於法律適用之規定，定其應適用之法律；該國關於法律適用之規定不明者，適用該國與當事人關係最切之法律。