Successively, in the sealing step, the lead bonding portion of the bonding pad 7 of the semiconductor chip 1 and the lead 11 of the flexible wiring substrate 3 are resin encapsulated, for example, by coating a sealant 6, such as an epoxy resin, from a dispenser 19 to thereby enhance the reliability at the junction portion between the semiconductor chip 1 and the flexible wiring substrate 3 (step 5