A material testing machine is provided. A screen for numerical value input is provided with numerical value input keys that are composed of a decimal point key, number keys of 0-9 and a symbol changing key for changing symbols of plus or minus of input numerical values, operation keys assigned to four arithmetic operations, an equal key for obtaining a calculation result, an input column in which values that are input using numerical value input keys and so on are displayed, a clear key for deleting the numerical values or operations input previously and emptying the input column, a backspace key for deleting the numerical values in the input column character by character, and parameter buttons assigned to parameters stored in a storage part.