A transaction management device can executed, with a simple procedure, a plurality of if-done orders in parallel and can reduce the risk of the client. In the transaction management device, an order receiving unit receives buy and sell order application information from client terminals. An order information generation unit generates a plurality of order information groups for each of the items of the buy and sell order application information received by the order receiving unit, the order information groups each including: a first order for placing one of a buy order or a sell order at a first order price; a second order for placing the other one of the buy or the sell order at a second order price; and a stop order for placing the other one of the buy order or the sell order at the stop order price. The first order price, the second order price, and the stop order price are set to different values for each of the order information groups. A storage unit stores the order information groups generated in the order information generation unit. An execution information generation unit, when starting transaction processing corresponding to each of the order information groups, sets the first order to be valid, the second order to be invalid, and the stop order to be invalid.