To provide a combination weighing machine for automatically conducting self-diagnosis of operation of respective movable parts equipped in the weighing machine.

The combination weighing machine 99 includes: a plurality of scale hoppers 8 each equipped with a weight detector 9 for detecting the weight of weighing material charged therein; a plurality of feeders (dispersing feeders 30 and straight-advancing feeders 50) forming conveying routes for the weighing material to the plurality of scale hoppers 8 and a plurality of supply hoppers 7; an arithmetic controller 16 connected to respective drives driving the respective movable parts equipped in the weighing machine 99 and to the weight detector 9 for performing combined calculation while controlling the operation of the respective drives; and an operation setting display 17. An arithmetic control part 21 is structured so that the operation of the respective movable parts is inspected by causing the respective drives to operate to move the movable parts separately and sequentially starting from the lowest positioned one, and the result of inspection is displayed on the display 17.