A complex device includes: a substrate having a thick portion, a cavity and a membrane for bridging the cavity; and multiple piezoelectric elements having a lower electrode, a piezoelectric film and an upper electrode. A part of the piezoelectric elements has a projecting portion arranged on the upper electrode. The part of piezoelectric elements (30) provides a vertical pressure detection element. The piezoelectric elements further have an ultrasonic element other than the vertical pressure detection element. The ultrasonic element is arranged over at least the cavity of the substrate in a horizontal direction.