A harvesting machine comprising: a crop tank that is configured to temporarily store crop that the harvesting machine has harvested while travelling over a farm field; a measuring device that is configured to measure an amount of crop that has been stored in the crop tank; an unloader apparatus that is configured to discharge the stored crop out of the crop tank; characterized in that it comprises: a device control part that is configured to execute precise measurement oriented device setting processing to create a device state that allows the measuring device to perform precise measurement; a measurement control part, the measurement control part including: a precise measurement execution part that is configured to perform, by the measuring device, precise measurement which involves the precise measurement oriented device setting processing; and a simplified measurement execution part that is configured to execute, by the measuring device, simplified measurement which does not involve the precise measurement oriented device setting processing; an operational instruction processing part that is configured to output a precise measurement instruction to perform the precise measurement and a simplified measurement instruction to perform the simplified measurement, in response to an operation performed by using a manual operation device; and a measurement result recording part that is configured to, before the unloader apparatus performs crop discharging work, rewrite a simplified measurement result that has been recorded based on a preceding simplified measurement instruction, with a precise measurement result that is based on a succeeding precise measurement instruction. a crop tank that is configured to temporarily store crop that the harvesting machine has harvested while travelling over a farm field; a measuring device that is configured to measure an amount of crop that has been stored in the crop tank; an unloader apparatus that is configured to discharge the stored crop out of the crop tank; characterized in that it comprises: a device control part that is configured to execute precise measurement oriented device setting processing to create a device state that allows the measuring device to perform precise measurement; a measurement control part, the measurement control part including: a precise measurement execution part that is configured to perform, by the measuring device, precise measurement which involves the precise measurement oriented device setting processing; and a simplified measurement execution part that is configured to execute, by the measuring device, simplified measurement which does not involve the precise measurement oriented device setting processing; an operational instruction processing part that is configured to output a precise measurement instruction to perform the precise measurement and a simplified measurement instruction to perform the simplified measurement, in response to an operation performed by using a manual operation device; and a measurement result recording part that is configured to, before the unloader apparatus performs crop discharging work, rewrite a simplified measurement result that has been recorded based on a preceding simplified measurement instruction, with a precise measurement result that is based on a succeeding precise measurement instruction.