<p>When raising seawalls due to building height restrictions is difficult, as in the case of airport facilities, wave-dissipating works with a notch are used between wave-dissipating works and seawalls to increase the crown width. The notch part is important for the security activity. Even in the future, it will be widely used in the wave-dissipating block layers in offshore airports. Nevertheless, there is a limited amount of research on wave-dissipating works with a notch at the rear end of the crown that exist. The hydraulic model experiments were subsequently conducted to clarify the wave pressure characteristics of two covering forms of wave-dissipating works: the fully covered method and the two-layer method. The results of the experiments revealed that the difference in wave-dissipating work form has little effect on the wave pressure and that the wave pressure acting on upright walls in the case of the wave-dissipating work with a notch is 13% greater than that in the case without a notch in terms of the fully covered form and 9% greater than that in the case without a notch. In this way, it was indicated that notched wave-dissipating works reduce the stability and dissipating performance of the blocks compared to the normal works without notches. Therefore, caution should be exercised when using notched wave-dissipating works, and hydraulic model experiments are recommended to confirm stability and wave pressure performance.</p>