本論文主要在於探討中古屋交易常見之法律問題，由於中古屋不比新屋，其經過前手之使用，故其交易會有許多複雜之問題存在，對買賣雙方均有風險存在，由此可知，消費者在中古屋買賣契約中面臨了許多風險。而現今仲介業者繁多，已經在中古屋交易市場扮演極重要的角色，故本文所探討之問題絕大部分是以仲介業者之義務為重心。 本論文首先從基本問題出發，探討委託銷售契約之類型及法律定性，並參考外國法及我國實務、學說之見解，提出修正建議。同時也對仲介業者之種種義務及簽訂契約常見之各種糾紛也加以討論，主要包含實價登錄義務、契約審閱期間、不動產說明書製作、斡旋金及要約書之問題、以及凶宅、仲介業者報酬合理性、總店和加盟店間之責任關係。本論文欲對中古屋契約交易中產生之法律問題作一詳盡的探討，希冀對法律問題的解決及日後不動產經紀業管理條例之修訂有所助益。

凶宅係我國房屋交易市場中之重要交易訊息，由於我國風俗民情之關係，凶宅之出賣人有時會隱瞞房屋為凶宅之情事，使得不願買受凶宅之買受人買到凶宅，出賣人和買受人之爭端即因此而產生，這些關於凶宅交易的爭端都有個前提問題就是-何謂凶宅？因此本文首先整理法院實務對凶宅之定義、內政部與法院實務對於出賣人就凶宅之說明義務範圍之認定及出賣人違反說明義務之法律效果。 再者，凶宅交易之法律問題除了違反說明義務之法律效果外，尚涉及物之瑕疵擔保責任及意思表示錯誤之問題，是本文以買賣瑕疵擔保與意思表示錯誤等規定為中心，整理法院實務與學說之見解，探討買受人於買到凶宅時是否可主張物之瑕疵擔保責任及意思表示錯誤。 / Hounted houses have always been considered important transactional information by housing trading market in Taiwan. Because of custom and tradition, a seller often conceals haunted houses from a buyer, and the buyer who does not want to buy a haunted house will buy that. Then, the dispute between the seller and the buyer will happen. Therefore, the article collects and analyzes the meaning of haunted houses defined by courts, which kinds of hounted houses sellers should tell buyers defined by courts and the Ministry of the Interior, and the legal effects of violating the duty to disclose. Moreover, the legal issues of the trades of hounted houses are warranty for defective goods and mistake of expression of intent besides the legal effects of violating the duty to disclose. Based on Civil Code, court decisions of District Court and High Court and scholars' opinions, the article discusses whether the buyer who bought a haunted house may revoke the expression or not and whether the seller may be responsible for a warranty when there is a defect in the thing he sold or not.