An ultrasonic device includes a substrate having a first opening, a second opening and a wall part partitioning the first opening and the second opening； a first vibration film and a second vibration film which close the first opening and the second opening respectively； a first piezoelectric element and a second piezoelectric element which are formed on surfaces of the first vibration film and the second vibration film opposite to the substrate； an acoustic matching layer which is disposed within the first opening and the second opening so as to come into contact with the first vibration film and the second vibration film.
