PURPOSE:To prevent the penetration of moisture and thereby to improve device reliability by a method wherein sealing by means of resin is accomplished with a synthetic resin thin plate large enough to cover the tab and the ends of inner leads is attached to the side of a pellet which is not to be used for the installation of said pellet. CONSTITUTION:To the sides of inner leads 5a and a tab 3 that will not be used for the installation of the pellet, a synthetic resin thin plate 8, slightly smaller than the area surrounding dams 6 and frames 6a and provided with windows 7whereat tab- supporting leads 4 abut, is attached, by using a epoxy-base adhesive agent. Silver paste 10 is used to attached a pellet 9 to the tab 3 and lines 11 are connected at a low temperature. The portions of the tab-supporting leads 4 positioned within the windows 7 are cut off. Next, the pellet 9 and inner leads 5a are sealed in resin, when the pellet 9 will experience no positional deviation because the tab 3 and the inner leads 5a are fixed with the thin plate 8. When the resin has become cold, the extruding leads 4 and dams 6 are cut off for the forming of leads 5. The tab-supporting leads 4 are thus cut off within the resin, stopping moisture from travelling along the stretch of the leads 4.
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