Component supply method

Provided is a component supply method capable of supplying a plurality of door components corresponding to the type of a vehicle body flowing on a vehicle body assembling line to a door manufacturingline (3) so as not to generate excess or deficiency. The component supply method is a method that a door panel assembled on the door manufacturing line is assembled to a vehicle body on the vehicle body assembling line for continuously producing vehicles of different models in predetermined batch units by supplying a plurality of door members necessary for assembling the door panel to the door manufacturing line, the method comprising: a shelf loading step for installing the door members of different batch units for each of a plurality of movable shelves (S-1, S-2,..., S-L) prepared in advance; a sorting step of taking out a quantity of door members corresponding to one vehicle from the plurality of movable shelves (S-1, S-2,..., S-L) and loading the door members on a matching packing trolley (C); and a sending-ou