A circuit board for body fluid collection include a first substrate including a puncture needle a second substrate disposed at an upstream side of the first substrate in a direction of puncturing with the puncture needle with a space provided therebetween a flexible insulation layer that extends between the first substrate and the second substrate and a conductive pattern provided on the flexible insulation layer, the conductive pattern integrally including an electrode, a terminal, and a wiring that electrically connects the electrode and the terminal.
