A material testing machine, which comprises a graphical user interface comprising a display device and an input device, wherein the material testing machine comprises a control device that has: a display control part configured to control a screen display to the display device; a storage part configured to associate calculation formulas for working out material characteristic values from measurement data with test information and store the calculation formulas; and an operation part configured to work out the material characteristic values using the calculation formulas read out from the storage part; wherein the display control part is configured to display a first input interface, in which numerical value display columns (42, 43) are provided, in the display device, and to display a second input interface in the display device when an instruction for inputting numerical values to the numerical value display columns (42, 43) is received from the first input interface, wherein the second input interface is provided with an input column, number keys which accept input operations of the numerical values input into the input column, operation keys which correspond to four arithmetic operations, parameter buttons which are associated with parameters comprised in calculation formulas corresponding to a test selected by a user, and a confirmation button (48, 58) which reflects the numerical values of the input column in the numerical value display columns (42, 43) in the first input interface; wherein the operation part is configured to calculate, based on the test information, the parameters comprised in the calculation formulas corresponding to the test selected by the user; and characterized in that the storage part is configured to associate the calculated parameters which have been calculated by the operation part with the parameter buttons, and to store these calculated parameters; wherein the display control part is configured to control the display device to display the calculated parameters which have been calculated by the operation part on the parameter buttons. a display control part configured to control a screen display to the display device; a storage part configured to associate calculation formulas for working out material characteristic values from measurement data with test information and store the calculation formulas; and an operation part configured to work out the material characteristic values using the calculation formulas read out from the storage part; wherein the display control part is configured to display a first input interface, in which numerical value display columns (42, 43) are provided, in the display device, and to display a second input interface in the display device when an instruction for inputting numerical values to the numerical value display columns (42, 43) is received from the first input interface, wherein the second input interface is provided with an input column, number keys which accept input operations of the numerical values input into the input column, operation keys which correspond to four arithmetic operations, parameter buttons which are associated with parameters comprised in calculation formulas corresponding to a test selected by a user, and a confirmation button (48, 58) which reflects the numerical values of the input column in the numerical value display columns (42, 43) in the first input interface; wherein the operation part is configured to calculate, based on the test information, the parameters comprised in the calculation formulas corresponding to the test selected by the user; and characterized in that the storage part is configured to associate the calculated parameters which have been calculated by the operation part with the parameter buttons, and to store these calculated parameters; wherein the display control part is configured to control the display device to display the calculated parameters which have been calculated by the operation part on the parameter buttons.