Creep of elastic support rubber used for main engine on actual ship was measured periodically between 8 years half. And the effects of the creep on property (rubber hardness, compression spring constant, tension intensity, elongation), vibration displacement, and vibrational acceleration were examined. Coefficient of thermal expansion by temperature change of rubber vibration isolator agrees almost even in the condition that the load was taken with theoretical value. Degradation of the property of the rubber as the distortion rate reached 15% was about average 20% and deterioration quantity as vibration isolator were 5 or 10dB in the average of each frequency.
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