A machining control device (10) controls a tool (11) for machining a first workpiece. The machining control device (10) has a drive unit (200) for driving the tool (11), an output unit (300), and a control unit (100) for controlling the drive unit (200) and the output unit (300). The control unit (100) transmits machining information obtained by performing preliminary machining on a second workpiece (W1) before performing first machining on a first workpiece (W1) to the output unit (300), whereby the machining information is outputted from the output unit (300). The control unit (100) generates a control command for performing second machining to be performed after the first machining of the first workpiece (W1), and the control unit (100) controls the drive unit (200) on the basis of thecontrol command.