Construction contract is a contract known in the construction of buildings, implemented by both government and private. That in the contract kostruksi the principal requires a guarantee from the contractor in fulfillment of the obligations in the form of a bank guarantee which ensures the fulfillment of obligations of the contractor in the event of default. The main function of the bank is the savings and loan business, bank credit function for this is the principal banking establishment in addition to the functions of other bank services such as letters of credit or bank guarantee. As for some types of Bank Guarantee which is used to support the execution of construction contracts are: 1) Bank Guarantee in Tender (Bid Bond), 2) Bank Guarantee in Implementation (Performance Bond), 3) Bank Guarantee in Advance (Advance Payment Bond), 4) Bank Guarantee in maintenance (Retention Bond). All forms of bank guarantee referred to above, requires the bank to pay if the party pledged contractors) are in default.