PURPOSE: A circuit board is provided to prevent a connection part of a connection pad and a substrate by including a protection terminal. CONSTITUTION: An element is mounted in a substrate unit(110). The substrate unit comprises an electrode pattern. A connection pad(120) is installed in the substrate unit. The connection pad electrically connects an electric element outside a substrate to the substrate unit. The cover unit(130) is installed on the substrate unit. The cover unit comprises a protecting terminal. The protecting terminal covers a part of the connection pad.
