This basic analysis aims at determining the notion of "post-war heavy industrial stage", that is to say, determining strictly the inner interrelations of the following three matters in this stage ; the structure of iron and steel production as the main axis of the post-war "state" monopoly capital, the specific low-wage labour and the extremely fragmentary half-proletarian landownership. The specific "post-war heavy industrial stage (1965-70)" in Japan capitalism has to be held by two indications. One of them is the material force of productions and the other is the structure of labouring class employing themselves in manufacturing establishments. The former indication, which is fundamental, lies in the fact that LD converter steel became 55% of all steel productions in 1965, which I might call "the converter stage in the post-war steel production". And the latter indication, which is subsequent to the former, lies in the fact that the labourers employing themselves in heavy industries became 50% of all manufacture labourers, that is, in 1970 the structure of manufacture labour turned out to be that of the post-war heavy industrial stage. At this "post-war heavy industrial stage", we must point out, as showing its structural peculiarity, the fact that there is an extremely fragmentary half-proletarian landownership. This article is divided into two parts. The first part is the general consideration about the "post-war heavy industrial stage" and the second is the particular one about the post-war stage of the iron and steel production structures as the main axis of the post-war heavy industries. But the first part is further divided into two items. In the first item I have treated the bases of productive forces of the post-war heavy industrial stage. There I have pointed out first the rapid vortex-motion, from the pre-war open hearth furnace stage in 1961 to the post-war LD converter stage in 1965, which had been caused by the forcible constructions of LD converters, monster crucibles as its driving force; and next the rapid rise of iron and steel production and its limitation caused by the crush of IMF system in 1971. In the second item of the first part I have treated the position of the structure of manufacture labour at the stage of 1970 and the regional construction of that in the same time. There I have analysed the fact that the post-war heavy industrial stage came into being in the coexistencial phase of the constructions and the destructions. The former are the constructions of the strategic establishments of heavy industries, the nuclei of which are the plants of the iron and steel works, motor vehicles and motor vehicle equipment, and electronic devices, etc. And the latter are the degressions or destructions of ammonium sulphate industry from 1955 (it indicates the destruction of the post-war establishment of the extremely small farming, "jisakuno"), textile industries (especially cotton spinning mills) from 1961 and steel making and rolling and rolling by open hearth furnaces from 1962. Especially, by the destruction of post-war "jisakuno" owing to the agrarian landreform, his extremely fragmentary landownership has been into that of the half-proletariat. And it is this extremely fragmentary half-proletarian landownership that consists of the structural basis of the post-war heavy industrial stage. The second part of this article is also divided into two items. In the first item I have treated the forcible constructions, the starting point of which was the construction of so-called "sea-side fires" of Tobata-works in I960. In this process of constructions, there has been formed the new main range of the structure of iron and steel production in post-war Japan-the works of Tobata, Wakayama, Nagoya, Sakai, Fukuyama, Mizushima, Kimitsu, Kakogawa, Kashima and Oita, over and

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