PROBLEM TO BE SOLVED: To provide a combined harvester which can measure the weight of grains stored in a grain tank and can simultaneously smoothly perform position change operations between the work position and maintenance position of the grain tank.SOLUTION: The combined harvester in which the grain tank 9 for storing grains is supported on a machine frame 1 rotatably on a vertical axis between a work position for retreating the grain tank 9 on the inner side of the machine frame 1 and a maintenance position for projecting the grain tank 9 on the lateral outer side includes a weight measurement means 25 for measuring the weight of the grains stored in the grain tank 9 supported on the machine frame 1 to receive the load of the grain tank 9 and measure the weight, and a receiving guide member 26 for receive-supporting the lower end support portion 27 of the grain tank 9 and simultaneously guiding the grain tank 9 to a weight measurement position with the rotation from the maintenance position to the work position.
