PROBLEM TO BE SOLVED: To spread a solder member on islands of a lead frame and make it adapt to them in a short period with high quality, in a solder stirring unit of a semiconductor pellet mounter.;SOLUTION: A rotatable stirring pin 4 and a reducing gas inlet port 7 are installed on a solder stirring unit 1 the top end of which is recessed, solder 3 is put in a recess 6 while a reducing gas is fed into the recess 6, and the solder 3 on an island 2 of a lead frame 8 is stirred by the stirring pin 4.;COPYRIGHT: (C)2000,JPO
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