This machining tool (1) is provided with a tool information storage unit (9) containing tool usage information for specifying a tool to be used for machining when a numerical control (NC) program execution unit (5) executes an NC program, and a magazine operation panel (18) is provided with a notification unit (18b) for notifying an operator of a warning. When an operation signal is received from an input unit (18a) while the NC program execution unit (5) is executing the NC program, a tool change control unit (11) checks the tool usage information stored in the tool information storage unit (9) and causes a tool pot (17a) related to the operation signal to move to an attachment/detachment position (17c) if a tool held in the tool pot (17a) is not to be used for the machining, or causes a notification unit (18a) to issue a warning if the tool is to be used for the machining, said warning indicating that such operation cannot be handled.