A machining-information management device (20) that manages machining information for a machine tool (11) that machines a workpiece by moving said workpiece relative to a tool and/or moving said tool relative to the workpiece on the basis of a machining program. Said machining-information management device (20) has the following: an extraction unit (22) that extracts a tool swap command and a coordinate-system selection command from a machining program (76) that machines a predetermined workpiece; an acquisition unit (23) that acquires tool information (77) associated with a tool specified in the aforementioned tool swap command and coordinate information (78) associated with a coordinate system specified in the aforementioned coordinate-system selection command; and a generation unit (24) that generates combined machining information that contains the abovementioned machining program (76), the aforementioned tool information (77), and the aforementioned coordinate information (78).