Bien que la solidarité en droit civil français, qui puise ses origines en droit romain, ait été importée dans les Codes civils coloniaux du Vietnam, elle n'est pas adoptée par le droit civil moderne du Vietnam. L'obligation solidaire présentée par le droit civil vietnamien est particulièrement originale. Elle s'écarte du droit civil français ainsi que du droit romano-germanique. Il existe une équivalence fonctionnelle entre l'obligation solidaire en droit vietnamien et la solidarité en droit français. La principale différence est l'absence des effets secondaires de l'obligation solidaire en droit civil vietnamien. Quant à l'obligation in solidum en droit civil français, celle-ci a un équivalent fonctionnel dans la responsabilité solidaire en droit civil vietnamien. Cependant, si l'obligation in solidum en droit civil français présente à la fois une pluralité de sources et une unité de source, la responsabilité solidaire en droit civil vietnamien ne connait qu'une unité de source. La mondialisation du droit et le vent de réformes du droit des obligations en Europe au sein de laquelle la France se trouve, apportent une chance pour que l'obligation solidaire en droit civil du Vietnam puisse s'approcher de la solidarité du droit civil occidental en général et du droit civil français en particulier. / The obligation solidaire in French civil law took its origins from Roman law. This law was imported to Colonial Civil Codes of Vietnam, however it was not adopted by the modern civil law of Vietnam. The joint and several obligation presented by the Vietnamese civil law is original. It diverges from the French civil and Romano-Germanic law. The joint and several obligation in Vietnamese private law is functional equivalence to the obligation solidaire in French private law. The main difference is the absence of the secondary effects on the joint and several obligation in Vietnamese civil law. Due to the obligation jointly and severally in French civil law, it has a functional joint and several liability in Vietnamese civil law equivalent. However, if the obligation in solidum in French civil law has both a plurality of sources and a source unit; joint and several liability in Vietnamese civil law recognizes a source unit. The trend of globalization of law and selling reform of contract law in Europe in which France finds itself, provide an opportunity for the joint and several liability in civil law of Vietnam can approach the solidarity of civil law West in general and the French civil law in particular.

Summary. In this thesis there is treated legal institute solidary obligation relationship. It is one of that legal institutes which are not in the limelight of as many specialized works as they should be for their frequency of their use in practice. Although it could seem at first sight that the solidary obligation relationship is formed enough that there cannot arise any faintnesses there, but the opposite is true. There is not a one united theoretical view of solidary obligation relationship; the solidary obligation relationship can be understand as a one obligation relationship by the first view called theory of unity, but it can be understand as more obligation relationships which exist between creditor and every solidary debtors (in case of passive pluralism) or between debtor and every solidary creditor (in case of active pluralism) by the other view called theory of plurality. The most of specialized literature which take heed of solidary obligation relationship and which were written in recent time understand the solidary obligation relationship in accordance with the theory of plurality. This thesis in opposite to that specialized works understands solidary obligation relationship as a one obligation relationship in accordance with the theory of unity which is preffered in practice although it is...