A chime bar assembly includes a hollow body with a resonation space defined therein and a top opening is defined in a top of the hollow body. A metal plate is located above the top opening and supported by two rubber plates. A hitting device is connected to the rear end of the hollow body and includes a case which includes lugs to which a pivotal end of a rod is pivotably connected. An operation unit is connected to the case and pushes the pivotal end of the rod so that the sphere is lowered to hit the metal plate.