A machine tool (100) includes a magazine (150) capable of holding a plurality of tools, a machining body (40B) for machining a workpiece using at least one of the tools, and a control unit (50) for controlling the machine tool (100). The control unit (50) executes processing for acquiring tool information (224) regarding the tools. The tool information (224) defines a type and a state for each of the tools. The state includes an abnormal state and a normal state. The control unit (50) furthermore executes processing for determining, as a collection candidate tool, a tool in the abnormal state for which a tool of the same type in the normal state is not present in the magazine (150), based on the tool information (224), and predetermined processing regarding the collection candidate tool.