A machine tool comprising: a tool attachment device (36, 40, 46) to which a machining tool is to be mounted; a workpiece attachment device (50, 52, 54) to which a workpiece to be mounted, the workpiece is machined by the machining tool; a control unit configured to control axial movements of at least one of the tool attachment device (36, 40, 46) and the workpiece attachment device (50, 52, 54); a mode selecting unit (15, 16) configured to select a manual operation mode or an automatic operation mode; an axis selection switch (20-29, 166) to select a target axis for the axial movement by the control unit in a case where the manual operation mode is selected; an operation panel of which a surface is provided with the mode selecting unit (15, 16) and the axis selection switch (20-29, 166), the panel including a display, an operation surface, and an input key group; a cover portion (33, 37) to cover a machining area in which the machining tool is to machine the workpiece; and a window provided in the front side of the cover portion (33, 37) for a worker to monitor the machining area through the window; wherein the operation panel including the axis selection switch (20-29, 166) two-dimensionally disposed on its surface is supported on the front side of the cover portion (33, 37) in a rotatable manner so that the operation panel will be parallel or orthogonal to the window; characterized in that the machine tool further comprises a manual operation auxiliary display unit fitted in the window and configured to display directions of axes in the window such that the worker can simultaneously monitor the machining area and the manual operation auxiliary display unit; the manual operation auxiliary display unit is configured to display an axis configuration model whose directions coincide with the directions of the plurality of axes included in the machine tool as viewed through the window in a case where the manual operation mode is selected; the axis configuration model is made by combining a plurality of symbols three-dimensionally; and the axis names and the direction signs are added to the axis configuration model. a tool attachment device (36, 40, 46) to which a machining tool is to be mounted; a workpiece attachment device (50, 52, 54) to which a workpiece to be mounted, the workpiece is machined by the machining tool; a control unit configured to control axial movements of at least one of the tool attachment device (36, 40, 46) and the workpiece attachment device (50, 52, 54); a mode selecting unit (15, 16) configured to select a manual operation mode or an automatic operation mode; an axis selection switch (20-29, 166) to select a target axis for the axial movement by the control unit in a case where the manual operation mode is selected; an operation panel of which a surface is provided with the mode selecting unit (15, 16) and the axis selection switch (20-29, 166), the panel including a display, an operation surface, and an input key group; a cover portion (33, 37) to cover a machining area in which the machining tool is to machine the workpiece; and a window provided in the front side of the cover portion (33, 37) for a worker to monitor the machining area through the window; wherein the operation panel including the axis selection switch (20-29, 166) two-dimensionally disposed on its surface is supported on the front side of the cover portion (33, 37) in a rotatable manner so that the operation panel will be parallel or orthogonal to the window; characterized in that the machine tool further comprises a manual operation auxiliary display unit fitted in the window and configured to display directions of axes in the window such that the worker can simultaneously monitor the machining area and the manual operation auxiliary display unit; the manual operation auxiliary display unit is configured to display an axis configuration model whose directions coincide with the directions of the plurality of axes included in the machine tool as viewed through the window in a case where the manual operation mode is selected; the axis configuration model is made by combining a plurality of symbols three-dimensionally; and the axis names and the direction signs are added to the axis configuration model.