本研究探討關係人交易、公司治理與銀行利率之關聯性。根據我國財務會計準則公報第六號規定所揭露之相關關係人交易項目，以多元迴歸模型來解釋銀行在進行授信決策時，如何解讀企業財務報表中之關係人交易，以測試利益衝突假說。同時，為探求關係人交易與公司治理之關聯，將考量公司治理因素加入授信決策後，以多元迴歸模型解釋銀行對原關係人交易解讀是否產生改變。樣本取自於上市櫃公司，實證結果顯示關係人交易與銀行授信利率有顯著關係，且利益衝突假說成立。進一步探討後發現，當迴歸模型加入公司治理變數後，實證結果顯示公司治理變數對銀行授信利率有著非常顯著之影響，而關係人交易對銀行授信利率變成不顯著。 / This study investigates the relationship between the related party transaction and loan interest rate before/after the consideration of corporate governance mechanism. We also explain the effect of related party transaction on interest rate based on the conflict of interest hypothesis. The sample consists of firms listed in Taiwan Stock Exchange and OTC firms. The result shows that the related party transaction has significant effect on loan interest rate. However, this effect disappears after considering the corporate governance.