Excited modes in cleaning tub are mainly composed of vibration mode and sound mode. The sound mode (named E mode) contributes to cleaning. It is found that E modes are influenced by material constants and thickness of tub wall. In this paper, we have investigated the influence on the sound mode when the stainless block is put to the bottom of the cleaning tub. It has been found as to E₁₁₂ mode that the sound mode nearby the bottom approaches to the sound mode when the bottom is rigid body.