To provide a device, a system, and a method for managing a financial product transaction which allow a person who does a transaction to properly take the form of the transaction including a partial agreement.SOLUTION: A first financial product transaction management device and a second financial product transaction management device include an order information generation unit for generating order information and an agreement managing unit for managing an agreement of a financial product. If processing of making an agreement by an agreement managing unit 16 is done on partial first orders 72aa1 alone that satisfy the condition of the agreement of first orders formed by the order information and second orders for settling the position agreed and held by the first orders by an agreement and/or on partial second orders 72baa1 that satisfy the condition of second orders, the order information generation unit performs processing of issuing new first order 72aaa1 of a quantity corresponding to the partial first orders 72aa1, on which the processing of agreement has been done, and/or the partial second orders 72baa1, on which the processing of agreement has been done.SELECTED DRAWING: Figure 26
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