A combination weigher of the present invention is configured such that a plurality of weighing hoppers (4) are divided into base groups (FG1, FG2) and adjustment groups (CG1, CG2) between them, collecting funnels (7A, 7B) are provided at a lower part of a collecting chute (6), and movable plates (10) are provided to selectively discharge the objects to weighed from each adjustment group (CG1, CG2) to one of the collecting funnels (7A, 7B). A control unit (20) is configured to combine each adjustment group with either one of the base groups to create discharge groups each including one base group and made up of the weighing hoppers (4) arranged continuously and to perform combination calculation to determine weighing hoppers (4) forming an optimal combination in each discharge group, and configured to cause the movable plate (10) to move according to the discharge group to which each discharge group belongs and to cause the weighing hoppers (4) forming the optimal combination to discharge the objects to be weighed.