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The vulnerability functions which express the relationships between damage ratios of household goods and seismic intensities of floor responses have been developed from the results of questionnaire surveys for recent five earthquakes. It has become cleared that the damage ratios of household goods of five earthquakes are relatively equal, if they are classified according to the structural damage levels of buildings. Then, the developed vulnerability functions of household goods are classified into three structural damage levels of buildings. Using the developed functions, seismic damage of household goods can be easily estimated for each family and for various earthquakes.

In part 2, the fixing conditions of large furniture in houses were analyzed using the results of questionnaire surveys. At first, it was confirmed that there was no bias for attitudes to disaster prevention in the respondents of internet surveys. Next, the average fixing ratios of large furniture ware calculated for each kind of furniture and household attribute. The analyses revealed that the effective fixing ratios are about 10% and the ratios vary according to the prefecture. In addition, the reasons for not fixing furniture at most houses were also extracted from the surveys.

Questionnaire surveys were carried out on numbers and fixing conditions of some household goods for various families in the whole country using internet system. In part 1, analyses of questionnaire survey revealed that which of household attributes have large influence on numbers of household goods, and the average numbers of household goods were calculated for influential household attributes. The results can be utilized for estimation of earthquake damage not only to household goods but also to people in house due to overturn of household goods.