This paper is concerned with the attitude of the Guro inhabiants concerning medical care system in terms of the credibility of hospitals. The credibility may be consisted of three components : availability, friendliness, and expertness. These were considered as dependent variables. Independent variables were age/education/income/perception of differentiation. The questionnaire was administered to 127 stratified samples in Feb. 1982. The results were as follows : 1) The group whose age was above 50 years gave a favor for the medical care system in terms of credibility. This fact implied that cultural influence on the perception and attitude about medical care system was very crucial, and it was noticed that doctor-patient relationship have been changing. 2) The attitude of the inhabitants on the credibility was appeared generally as unfavorable and indifferent. 3) According to $X^2$-test, education, income, and perception of differentiation were identified as having statistically significant trelationships with friendliness factor.