According to one embodiment, a transducer includes: a first conductive member; a substrate forming a first space with the first conductive member; a second conductive member opposed to the first conductive member via the substrate, and forming a second space with the substrate; first conductors electrically connecting the first conductive member with the second conductive member; a first transmission conductor in at least one of the first/the second spaces; and a second transmission conductor in at least one of the first space or the second space, and separated from the first transmission conductor, wherein the second conductive member includes a through hole through the second conductive member in a direction opposed to the first conductive member, and connecting to the second space, and an orthogonal projection of the through hole in the direction includes at least portion of each of the first/the second transmission conductor.