民法研究與民法解釋（譯文）

Research and Interpretaion of Civil Law

本文係以履行輔助人、出賣人擔保責任及債權讓與三個議題，介紹日本民法債權法在2017年修法前後之改變，並簡要比較臺灣民法之相關規定。透過日本民法修法前後規範內容之比較，本文認為，有些議題在理論上雖存有激烈對立之見解，但這些對立之見解實際上對結論並無影響，相反地，理論上之演繹即可得出結論之議題，反而實際上隱含著許多問題。

This article focuses on the three topics of agent of the debtor, warranty of the seller and the transfer of a claim, introduces the changes in Japanese Civil Code which is amended in 2017 about these topics, and briefly compares the relevant provisions of Taiwan’s Civil Code. By comparing the normative of before and after the amendment, this article believes that although there are fiercely opposing views on some issues in theory, these opposing views have no impact on the conclusions. On the contrary, the conclusions can be simply obtained through theoretical deduction, but it actually implies many issues.