The headquarters is situated in the area between Suidōbashi Station and Kanda River, at a location previously used as a warehouse for the company's own printing plant.

From the outset, the company focused its business on academic fields, publishing dictionaries, encyclopedias, textbooks, and for a period, maps, as well as selling educational materials.

In 1915, at the suggestion of Tadakazu's son, Torao, who was a university student at the time and had a background in economics and accounting, the publishing business and bookstore would be separated.

[3] Shin Meikai kokugo jiten is the highest-selling Japanese-language dictionary in Japan, and is well known for its unique and straightforward definitions and examples.

The philosophy behind Shin Meikai kokugo jiten would prefer to retain older words, even if had begun to fall out of common use, and its text didn't hesitate to give lengthy explanations.

Daijirin competes with Iwanami Shoten's Kōjien in the market share for single volume dictionaries, and is known for its thoroughness and abundance of modern and katakana words.