This drive control device (32A, 32B, 52, 54, 56, 61, 62, 71, 72) of two semiconductor elements (1A, 1B) having a diode structure (6) and a transistor structure (5) having a powered electrode (15, 18) in common is provided with: a current detection means (7A, 7B, 25, 59, 60, 68) that outputs a current detection signal of the semiconductor elements; and a first control means (27) that, when it has been determined that current is flowing in the forward direction of the diode structure in the semiconductor element during the period that an on command signal is being input to the semiconductor element, outputs a gate drive signal from the point in time that a first time has elapsed to the point of time a second time has elapsed relative to the point in time that a subsequent off command signal is input. The first time and second time are pre-set in a manner such that an arm short-circuit does not arise between the two semiconductor elements.