A connector substrate includes a base material, n first input terminals of m groups (m and n are an integer equal to or greater than 2) which are provided on the base material, n first output terminals which are provided on the base material, first wiring patterns which are disposed on or inside the base material and connect the first input terminals and the first output terminals, m second input terminals which are provided on the base material, m second output terminals which are provided on the base material, and second wiring patterns which are disposed on or inside the base material and connect the second input terminals and the second output terminals, in which a first end of each connector wiring constituting the first wiring pattern is connected to one of the n first input terminals constituting each group, and a second end is connected to one of the first output terminals.