Abstract
In this paper, the author will make it clear that the main object of "Science Aiming to Product" published in 1941 by Jun TOSAKA (1900-45), based on historical investigation focusing on the role of 'technology' in his theory of ideology. Objects of this investigation will include some papers unrecorded in The Complete Works of Jun TOSAKA. In 1929, he put 'practice' as an important position in his theory of science and ideology, and didn't use 'experiment' or 'technology'. At first, his 'practice' meant 'politics' mainly, then that included meaning of 'experiment' and 'production' too in 1932. Since 1933, he became to put 'technology' as an important position in place of 'practice'. But he had been grasped 'experiment' as 'practice' until 1941. On the other hand, to grasp 'science' and 'technology' as 'practice' became the mainstream of the press in 1941. In that situation, he reviewed the relationship between 'science' and 'technology'. And he became to grasp 'experiment' as 'material production'. Then he could make the view of science founded on production thorough.
