PURPOSE: To cut a lead frame at every arbitrary number of substrates, and to insert an arbitrary number of substrates by controlling the number of revolution of a pinion.

CONSTITUTION: A feed ratio of the lead frame 4 corresponding to the number of the electrodes of the substrate 1 can be set easily by arbitrarily setting the number of revolution of the pinion 11 by controlling a motor 12, etc., and guide width to the dimensional change of the substrate 1 and the positions of inserting heads 22, 23 are obtained easily only by moving a movable block 19 on a sliding base 17. Consequently, the inserter has excellent corresponding capability to various substrates 1 of the different number of electrodes. The lead frame into which an arbitrary number of the substrates are inserted is obtained by the conditions, etc. of the next process, a rack 10 and the pinion 11 are used for the feed-mechanism of the lead frame 4, each mechanism section can be constituted at distances of the irreducible minimum of a demand, and a spool on which the lead frame 4 is wound is positioned at an upper section, thus manufacturing the device extremely more compact than the conventional devices.