This work has as initial objective to present the project bond as a financing instrument for a project finance. The project bond is based on the bonds issue (debt titles) specifically for the financing of a project, being the cash flow generated by the project the main source payer of the loan. As the structuring of a project finance involves the creation of a SPC (Specific Propose Company), it is through this company, that the bonds is issued to finance a project. The project bond can represent a portion of the debt just used in the project finance, not being necessarily responsible for the totality of the financing of the project. After comparing this product with other financing products, it is make a comparison among two emissions of bonds from Petróleo Brasileiro S.A (Petrobras) in the international market: a corporate bond issued by the company and a project bond issued by a SPC to finance the Marlim Project. The present study still try to verify if it made difference for Petrobras, in terms of debt cost, to be financed at the international capital market through corporate bond or through project bond and to analyze if the international market evaluates in a different way the risk of a corporate bond of Petrobras and the risk of a project bond of a Petrobras project.