An ultrasonic device unit includes ultrasonic transducers disposed in an array. A first multiplexer is connected to the ultrasonic transducers through N element side wiring lines, which are aligned in a first direction along the contour of an element array in plan view, and connects M (M<；N) circuit side wiring lines selectively to the element side wiring lines. A second multiplexer is connected to the ultrasonic transducers through L element side wiring lines, which are aligned in a second direction along the contour of the element array in plan view, and connects K (K<；L) circuit side wiring lines selectively to the element side wiring lines.
