A feeder component type determination method which determines combinations of a plurality of tape feeders and a plurality of component types (P1-P8) of components (P) which are stored in carrier tapes in a component mounting machine provided with a component supply device equipped, in a detachable manner, with the plurality of tape feeders each of which holds a carrier tape in which the plurality of components (P) is stored at an equal pitch (Lp) and sequentially supplies the components (P) to a corresponding supply position , and a component transfer device which sucks the component (P) which is supplied to the supply position and mounts the component (P) to a printed circuit board which is positioned in a mount-execution position, the feeder component type determination method comprising: a positional precision measurement step of measuring a positional precision at the supply position for at least a portion of the tape feeders , and characterized by a component type determination step of determining the combinations of the tape feeders and the component types (P1-P8) of the components (P) which are stored in the carrier tapes based on the positional precision of the tape feeders and at least one of component external dimensions which are determined according to the component type (P1-P8) of the components (P) and an allowable positional precision when the components (P) are supplied to the supply position by the tape feeder , wherein, in the component type determination step, the higher the positional precision of the tape feeder , the smaller the component external dimensions of the component type (P1-P8) that is combined therewith, and the lower the positional precision of the tape feeder , the larger the component external dimensions of the component type (P1-P8) that is combined therewith, and, alternatively the higher the positional precision of the tape feeder , the stricter the allowable positional precision of the component type (P1-P8) that is combined therewith, and the lower the positional precision of the tape feeder , the more lenient the allowable positional precision of the component type (P1-P8) that is combined therewith. a positional precision measurement step of measuring a positional precision at the supply position for at least a portion of the tape feeders , and characterized by a component type determination step of determining the combinations of the tape feeders and the component types (P1-P8) of the components (P) which are stored in the carrier tapes based on the positional precision of the tape feeders and at least one of component external dimensions which are determined according to the component type (P1-P8) of the components (P) and an allowable positional precision when the components (P) are supplied to the supply position by the tape feeder , wherein, in the component type determination step, the higher the positional precision of the tape feeder , the smaller the component external dimensions of the component type (P1-P8) that is combined therewith, and the lower the positional precision of the tape feeder , the larger the component external dimensions of the component type (P1-P8) that is combined therewith, and, alternatively the higher the positional precision of the tape feeder , the stricter the allowable positional precision of the component type (P1-P8) that is combined therewith, and the lower the positional precision of the tape feeder , the more lenient the allowable positional precision of the component type (P1-P8) that is combined therewith. <EOS>