O’Hanlon et al. gave a full range data on motion sickness for single frequency sinusoidal vertical motions. When it is used for ship motion, there are some problems because ship motion distributes in wide frequency range. In this paper, motion sickness in two frequency vertical motions and ship motions distributed in wide frequency range are studied. And it is shown that vertical acceleration components in higher frequency range may have bigger effects on motion sickness than estimated from O’Hanlon’s data.