A buzzer unit including: a case including a vibrating plate in which no through-holes are formed, the case including a storage space formed therein on one surface side of the vibrating plate; a vibrating element which faces the vibrating plate in a plate thickness direction of the vibrating plate inside the storage space, the vibrating element which produces vibration as a result of voltage being applied thereto and causes the vibrating plate to vibrate; and a pressing member stored in the storage space, the pressing member pressing the vibrating element against the vibrating plate, wherein - the vibrating element is in the shape of a flat plate with a plate thickness direction coinciding with a plate thickness direction of the vibrating plate; - the case includes a top plate which includes a thick portion opposed to an outer edge portion of the vibrating element from the plate thickness direction and a thin portion opposed to an inner portion surrounded by the outer edge portion of the vibrating element from the plate thickness direction, the thick portion which the vibrating element is pressed against, the thin portion being thinner than the thick portion; - at least the thin portion constitutes the vibrating plate; and - a first space surrounded by the thick portion and sandwiched between the thin portion and the vibrating element in the plate thickness direction is formed on one surface side of the vibrating plate. a case including a vibrating plate in which no through-holes are formed, the case including a storage space formed therein on one surface side of the vibrating plate; a vibrating element which faces the vibrating plate in a plate thickness direction of the vibrating plate inside the storage space, the vibrating element which produces vibration as a result of voltage being applied thereto and causes the vibrating plate to vibrate; and a pressing member stored in the storage space, the pressing member pressing the vibrating element against the vibrating plate, wherein - the vibrating element is in the shape of a flat plate with a plate thickness direction coinciding with a plate thickness direction of the vibrating plate; - the case includes a top plate which includes a thick portion opposed to an outer edge portion of the vibrating element from the plate thickness direction and a thin portion opposed to an inner portion surrounded by the outer edge portion of the vibrating element from the plate thickness direction, the thick portion which the vibrating element is pressed against, the thin portion being thinner than the thick portion; - at least the thin portion constitutes the vibrating plate; and - a first space surrounded by the thick portion and sandwiched between the thin portion and the vibrating element in the plate thickness direction is formed on one surface side of the vibrating plate. - the vibrating element is in the shape of a flat plate with a plate thickness direction coinciding with a plate thickness direction of the vibrating plate; - the case includes a top plate which includes a thick portion opposed to an outer edge portion of the vibrating element from the plate thickness direction and a thin portion opposed to an inner portion surrounded by the outer edge portion of the vibrating element from the plate thickness direction, the thick portion which the vibrating element is pressed against, the thin portion being thinner than the thick portion; - at least the thin portion constitutes the vibrating plate; and - a first space surrounded by the thick portion and sandwiched between the thin portion and the vibrating element in the plate thickness direction is formed on one surface side of the vibrating plate.