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.