In recent years, the body of research on academic Japanese has grown considerably, and a new research domain has emerged. Despite the advances in knowledge of academic Japanese, there is a gap concerning publication categories found in scholarly periodicals from Japan. Past studies focused on documents of the ronbun ("article") type, ignoring the existence of other relevant categories. The present study addresses this gap. In order to identify the main publication categories from Japanese scholarly journals, instructions to authors from periodicals found in the Japan Science and Technology Information Aggregator, Electronic (J-Stage)-an open-access, electronic database from Japan-were examined. As a result, six categories have been identified: sōsetsu ("general theory"), shiryō ("material"), kaisetsu ("explanation"), gencho ronbun ("original article"), shohyō ("book review"), and tanpō ("short report"). The way by which journals from J-Stage describe these categories was depicted by the compilation of descriptions extracted from instructions to authors. Furthermore, the six categories were characterized in terms of structure and visible fundamental purpose by means of an analysis of a sample of documents published in journals from J-Stage. Additionally, general linguistic features of Japanese journal documents were described based on directions found in instructions to authors.