Provided is a circuit board on which an electronic component including a first terminal and a second terminal that are arranged side by side is to be mounted, the circuit board including: an insulating holding member, a conductive plate, and a signal circuit, in which the conductive plate is held by the holding member, the first terminal is joined to the conductive plate, the signal circuit is formed on a surface of the holding member using conductive nanoink containing a flux, and an end portion of the signal circuit and the second terminal are joined to each other using solder.