| 摘要 |
The present invention provides a printed wiring board in which there is no positional deviation between a blind via hole and a round and which enables high-density wiring design to be easily achieved. Provided is a method of manufacturing a printed wiring board in which wiring pattern forming layers are connected by a blind via hole, which includes the steps of forming a wiring pattern by etching at least metal foil laminated on a surface of an insulating layer and forming a round having a window portion in a portion where a blind via hole is to be formed; irradiating the window portion with a laser beam having a diameter larger than the diameter of the window portion but smaller than the diameter of the round, thereby making a nonthrough hole for forming the blind via hole; and forming a blind via hole by forming a coating on the nonthrough hole and the round.
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