Vibration response of a finite plate makes up with two factors, namely a resonance and restraining effect by plate ends. In a preceding paper, an evaluation method of the resonance based on the diffuse index was presented. In a present paper, the restraining effect by plate ends was examined using numerical calculation method. As the results of this study, the followings are revealed. The restraining effect depends on the ratio of a distance from an excitation point to plate end and a wavelength of bending wave in excitation frequency. The restraining effect can be represented as a single regression function regardless of various conditions of the plate by separating the effect of resonance from vibration response. The restraining effect by two sides of the plate is approximated by the theorem of three squares. Vibration damping does not affect on the restraining effect.