A multilayer substrate includes a stacked body including first and second flexible insulating base material layers, and an actuator conductor pattern on at least the first insulating base material layer. The stacked body includes a first region including stacked first and second insulating base material layers, and a second region including stacked second insulating base material layers. The first region includes an actuator function portion in a portion thereof, the actuator function portion including the actuator conductor pattern. The thickness of the first insulating base material layer including the actuator conductor pattern is smaller than the thickness of one second insulating base material layer.