Abstract: Avehicle receives vibration in the up − and − down direction by the unevenness and hollow of the road surface , etc . Moreover , a centri釦 gal force is received by running a curve at a certain speed , Furthermore , an inertia force is received in the horizontal direction by jack rabbit start , a crash halt , etc . When receiving the fbrce and vibration , in the state where sic ess − and − wound people are sitting on the seat ofthe vehicle usua1 , sickness − and − wound people do not

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... el not much displeasingly . However , in the state where the body has lain down , since force and vibration get across to the head dh℃ ctly, displeasure happens very much and , as for sickness − and − wound people, condition gets increasingly bad . So , not only 山 e vibration of up − and − down direction but also 吐1e shake of the horizontal inertia fbrce and centri 血 gal − force dh7ection is reduced by the device, and this study aims at the development of the base − isolating device ofbed fbr ambulances which reduces displeasure .