We experienced a remarkable change of the relative pricesystem in Japan by the impact of the oil crisis. In our paperwe aim to search quantitatively the possibility of the substitutionamong various inputs corresponding to the changes of therelative price systems and measure the bias of technical changewith respect to each input. Here we classified the Japaneseeconomy into thirty industrial sectors and observed during theperiod 1960-1977. We tried to describe the producer behaviorby a trans-log price frontier function. We can draw on thework of Jorgenson and Fraumeni(1981) as a related research.As in the Japanese economy the oil crisis in 1973-1974 had anenomous impact on the economic structure, we can expect thatthere exists some structural changes on the parameters of theprice frontier function. Therefore we tried to estimate theparameters of price frontier function firstly in the samplesduring the period 1960-1972 and secondly in the samples duringthe period 1960-1977, which include the samples after the oilcrisis. If the impacts of the oil crisis were dominant in thesamples after 1973, estimated parameters in the latter samplesmight have statistically significant differences from the previouslyestimated parameters.According to the results we find that properties in terms ofthe elasticities of substitution do not change drastically at theoil crisis except the relation between capital and energy, whichrevealed a remarkable change from the independent relationship tothe complimentary relationship in the several industries. Resultsare summarized in [Table 5].On the other hand the bias of technical changes with respectto time had experienced a remarkable change in some industries.Before the oil crisis in Japan "capital using - labor saving -energy and material neutral" bias of technical changes aredominant in many industries. After the oil crisis, the resultssuggest that the bias of technical change moved significantlycorresponding to the changes of the relative prices as shown in[Table 6].The bias of technical change with respect to capital inputmoves to the input saving way for eleven industries. On thecontrary in sixteen industries the bias of technical change withrespect to labor input moves to the input using way. Also thebias of technical change with respect to energy and materialsmoves into the input saving way in almost one-third of the thrityindustries.