An input control method of a touch panel monitor for a working machine, the working machine comprising: an operating lever; a hydraulic actuator configured to actuate respective units of the working machine; and a hydraulic lock switch; the input control method comprising the steps of: switching, on a touch panel mounted on the working machine, between a monitor screen display and an input operation screen display where a monitor input operation is enabled, wherein when the working machine is operable by the operation of the operating lever, control is performed such that a monitor input lock state is created, in which the monitor input operation is disabled and the monitor screen display is enabled, and control is performed such that the monitor input lock state is released by a specific monitor input unlock operation on the touch panel so that the display is switched to the input operation screen display; the input control method further comprising switching the hydraulic lock switch between a hydraulic lock state where a manual operation of a hydraulic circuit by the operation of the operating lever that operates the hydraulic actuator is disabled, and a hydraulic unlock state where the manual operation of the hydraulic circuit by the operation of the operating lever is enabled, and control is performed such that the touch panel enters into the monitor input lock state when the hydraulic lock state is switched to the hydraulic unlock state by the hydraulic lock switch; wherein the unlocking operation regarding the monitor input lock state further comprises performing a specific monitor input unlocking gesture operation via at least one unlock icon (51, 52). an operating lever; a hydraulic actuator configured to actuate respective units of the working machine; and a hydraulic lock switch; the input control method comprising the steps of: switching, on a touch panel mounted on the working machine, between a monitor screen display and an input operation screen display where a monitor input operation is enabled, wherein when the working machine is operable by the operation of the operating lever, control is performed such that a monitor input lock state is created, in which the monitor input operation is disabled and the monitor screen display is enabled, and control is performed such that the monitor input lock state is released by a specific monitor input unlock operation on the touch panel so that the display is switched to the input operation screen display; the input control method further comprising switching the hydraulic lock switch between a hydraulic lock state where a manual operation of a hydraulic circuit by the operation of the operating lever that operates the hydraulic actuator is disabled, and a hydraulic unlock state where the manual operation of the hydraulic circuit by the operation of the operating lever is enabled, and control is performed such that the touch panel enters into the monitor input lock state when the hydraulic lock state is switched to the hydraulic unlock state by the hydraulic lock switch; wherein the unlocking operation regarding the monitor input lock state further comprises performing a specific monitor input unlocking gesture operation via at least one unlock icon (51, 52). switching, on a touch panel mounted on the working machine, between a monitor screen display and an input operation screen display where a monitor input operation is enabled, wherein when the working machine is operable by the operation of the operating lever, control is performed such that a monitor input lock state is created, in which the monitor input operation is disabled and the monitor screen display is enabled, and control is performed such that the monitor input lock state is released by a specific monitor input unlock operation on the touch panel so that the display is switched to the input operation screen display; the input control method further comprising switching the hydraulic lock switch between a hydraulic lock state where a manual operation of a hydraulic circuit by the operation of the operating lever that operates the hydraulic actuator is disabled, and a hydraulic unlock state where the manual operation of the hydraulic circuit by the operation of the operating lever is enabled, and control is performed such that the touch panel enters into the monitor input lock state when the hydraulic lock state is switched to the hydraulic unlock state by the hydraulic lock switch; wherein the unlocking operation regarding the monitor input lock state further comprises performing a specific monitor input unlocking gesture operation via at least one unlock icon (51, 52).