工程承攬契約不同於一般以財產權移轉為目的之有償性契約,其具有契約當事人對立性不明顯、重視雙方信賴關係、工作具有專屬性等特性且雙方之風險平衡應更受重視。在契約目的上, 定作人期望藉由工作之完成達成期預定之使用目的,而承攬人亦期望藉由完成工作獲得承攬報酬,是 雙方契約利益趨向一致,工作之完成將促使契約發揮最大效用,因此自契約特性及契約目的達成 為之角度觀察,工程承攬契約當事人雙方之合作格外重要。就承攬契約之給付義務上,我國多數實務見解認為,定作人依法負有完工後給付報酬之義務,然除法律另有規定或契約另有約外,並無促使契約完成之給付義務存在,因此認定民法第507條規定之協力行為,性質上非屬定作人之契約義務,然而,就承攬契約特性上觀察,似有未合。因 此,本文將自工程承攬契約之特性出發,參酌誠信原則及相關外國立法例之規定,重新審視工程承攬契約中定作人之協力行為性質及法律效果。
Construction contracts are different from general paid contracts.To complete construction, it depends on not only contractors’ work ,but also proprietors’ co-operation . In view of this,the duty to co-operate of the proprietor is important. However, most of judgments of the Supreme Court decree that proprietors do not have to give full effect to complete works.Many problems result from that cause damage to contractors. Therefor,this thesis focuses on characteristics of construction contracts, considers principle of good faith,compares with the regulations of other countries ,and explain for the duty to co-operate of the proprietor.