SUBSTRATE FOR MULTIPLE BOARDS AND WIRING BOARD

PROBLEM TO BE SOLVED: To facilitate measurement and inspection of a circuit by perfectly insulating circuits between circuit boards provided with castellation structure formed on substrate for multiple boards. SOLUTION: Many circuit boards Aij are formed on substrate for multiple boards. On the surface of the board 11, dividing lines 12 are formed along boundary lines of the circuit boards Aij, and through holes 13 are formed along the dividing lines 12. On the inner peripheral surface of each of the through holes 13, two castellation conductors are separately formed opposite to each other via the dividing line 12. On the single surface of the board 11, I/O lands 15 of each of the castellation conductors are separately formed opposite to each other via the dividing line 12. In the board 11, circuits of the individual circuit boards Aij are perfectly insulated before division by the dividing lines 12, so that measurement and inspection of circuit characteristics of the individual circuit boards Aij are enabled before division.