A wiring board has a substrate and an interconnect pattern formed on the substrate. The interconnect pattern includes a plurality of lands. Each of the lands includes a base section and an additional section extending from the base section, the base section of each of the lands having the same shape. When a spiral curve is rotated around an origin and disposed to pass over the base section, the additional section is formed to extend from the base section of any one of the lands in a direction along the spiral curve.

 
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