A combination weigher comprising: a plurality of weighing conveyors which are manually fed with objects in a deactivated state in which the objects are not conveyed, and conveys the objects fed manually; a plurality of weight sensors provided to correspond to the weighing conveyors , respectively, to measure weights of the objects held on the weighing conveyors ; a combination unit for finding a discharge combination including a combination of the weighing conveyors holding the objects in which a total weight thereof falls within a target weight range, based on weight values of the weight sensors ; a weighing conveyor control unit which activates the weighing conveyors selected to make up the discharge combination to convey the objects on the weighing conveyors in a first direction and discharge the objects from one ends of the weighing conveyors; and a collecting conveyor which is fed with the objects discharged from the one ends of the weighing conveyors , conveys the objects in a direction, and discharges the obj ects, the combination weigher further comprising a proper weight determiner unit for determining whether or not a weight of the objects held in each of the weighing conveyors falls within a proper weight range based on each of the weight values of the weight sensors ; characterised in that the weighing conveyor control unit is configured to, based on a result of the determination of the proper weight determiner unit , activate the weighing conveyor holding the objects having the weight which does not fall within the proper weight range to convey the objects in a direction opposite to the first direction, and to discharge the objects from the other end of the weighing conveyor . a plurality of weighing conveyors which are manually fed with objects in a deactivated state in which the objects are not conveyed, and conveys the objects fed manually; a plurality of weight sensors provided to correspond to the weighing conveyors , respectively, to measure weights of the objects held on the weighing conveyors ; a combination unit for finding a discharge combination including a combination of the weighing conveyors holding the objects in which a total weight thereof falls within a target weight range, based on weight values of the weight sensors ; a weighing conveyor control unit which activates the weighing conveyors selected to make up the discharge combination to convey the objects on the weighing conveyors in a first direction and discharge the objects from one ends of the weighing conveyors; and a collecting conveyor which is fed with the objects discharged from the one ends of the weighing conveyors , conveys the objects in a direction, and discharges the obj ects, the combination weigher further comprising a proper weight determiner unit for determining whether or not a weight of the objects held in each of the weighing conveyors falls within a proper weight range based on each of the weight values of the weight sensors ; characterised in that the weighing conveyor control unit is configured to, based on a result of the determination of the proper weight determiner unit , activate the weighing conveyor holding the objects having the weight which does not fall within the proper weight range to convey the objects in a direction opposite to the first direction, and to discharge the objects from the other end of the weighing conveyor . <EOS>