Patent ID: 7886438

Claim:
A method for manufacturing a multi-layer wiring board comprising the steps of: preparing a resin plate to be used for a base material with single-sided wiring circuit; forming a circuit portion on one surface of the resin plate; making via holes that penetrate the resin plate from the one surface to the other surface to reach at least one portion of the circuit portion formed on the one surface of resin plate; injecting conductive paste into the via holes; provisionally curing the conductive paste; dividing the base material with single-sided wiring circuit being formed by previous steps into a plurality of base materials with single-sided wiring circuits, each of the plurality of base materials having a different size and at least one of the via holes; positioning the base materials with single-sided wiring circuits on a motherboard to be placed thereon such that each of the plurality of base materials is in direct contact with the motherboard; and laminating the base materials with single-sided wiring circuits and the motherboard through a colaminating process while heating the base materials and the motherboard so that a main curing process on the conductive paste is performed.