大石産業 holds a 60% domestic share, centered on its pulp-mold egg cartons. Built around its two core businesses of cushioning materials and packaging materials, it has maintained profitability for 79 consecutive years.
大石産業 is a comprehensive manufacturer of paper- and plastic-based packaging materials headquartered in Kitakyushu, Fukuoka Prefecture. Revenue for the fiscal year ending March 2026 was ¥23.487 billion, and operating profit was ¥717 million. The business comprises two segments: cushioning materials and packaging materials.
The cushioning materials business accounts for approximately 50% of total revenue and provides protective materials that prevent damage during the transportation of fresh produce, eggs and other livestock products, and industrial products. It manufactures pulp-mold products such as egg cartons, drink carriers and fresh-produce trays, as well as corrugated cardboard products.
The packaging materials business develops packaging materials that wrap products in bags or film to prevent leakage and preserve freshness. Its film products include inner lids for miso containers, food trays, waterproof film for disposable diapers, high-performance films for electronic materials and heavy-duty packaging bags.