科学的合理性と二つの「社会」概念 Scientific rationality and two concepts of 'social' 伊勢田哲治 ISEDA Tetsuji The main aim of this paper is to think about the relationship between the sociology of scientific knowledge (SSK) and scientific rationality. The main part of the paper is a survey of SSK literature, which intends to establish that there are two major approaches in SSK, i.e. the social causation approach and t