Akasaka Diesels Ltd.
6022・Standard Market・Machinery
Business
Akasaka Diesels Ltd. was founded in 1910 and listed on the Tokyo Stock Exchange (now the Standard Market) in 1961 as a specialist manufacturer of marine internal combustion engines. Its core business is the manufacture and sale of Marine Internal Combustion Engines (Main Engines) (diesel engines), complemented by the supply of parts and repair work services. Its principal customers are shipyards and shipowners engaged in domestic coastal and near-sea shipping, and the company supplies the domestic market primarily with main engines for passenger-cargo vessels and fishing boats. It operates a manufacturing base in Yaizu City, Shizuoka Prefecture, with an integrated production system spanning casting, machining, assembly, and trial operation. In recent years, the company has also begun cultivating new businesses, including a lubricating oil purification equipment business and a biodiesel fuel manufacturing and sales business.
Business Model
Parts & Repair Work, which accounts for the majority of net sales (¥4,546 million in sales results for FY2026), forms a stable earnings base, complementing fluctuations in orders for main engine sales (¥2,538 million). The company manufactures and sells UE engines under a license agreement with Japan Engine Corporation, paying royalties at a fixed rate. Continued orders for Parts & Repair Work through the after-sales service network contribute to earnings stability.
Company Strengths
Since its founding in 1910, the company has handled the design, casting, machining, assembly, and trial operation of marine internal combustion engines on an integrated basis. It has maintained ISO9001 certification (obtained in 1996) and places the founder's parting words—"one must never build a machine that causes trouble for shipowners or crew"—at the core of its quality policy. Production results for FY2026 (ending March 2026) reached ¥8,452 million (on a sales price basis), with years of accumulated technical expertise underpinning manufacturing capability.
The order backlog for Marine Internal Combustion Engines (Main Engines) at the end of FY2026 (ending March 2026) reached ¥6,109 million (up 48.9% year on year), functioning as a leading indicator of earnings against the next fiscal period's planned sales of ¥9,000 million. Since main engines require a certain lead time from order receipt to delivery, the buildup in the order backlog has the effect of mitigating the risk of a short-term downturn in performance.
At the end of FY2026 (ending March 2026), the equity ratio stood at 60.2% and the current ratio at 193.2%, maintaining a high level of financial soundness. Of total assets of ¥18,217 million, fixed assets including investment securities account for a large portion, with net assets secured at ¥10,962 million. The interest coverage ratio stands at 11.4 times, indicating ample repayment capacity relative to interest-bearing debt.
ENVALITH's Perspective
Performance Trend
Revenue has expanded on a medium-term basis, rising from ¥6,400 million in FY2022 → ¥6,594 million in FY2023 → ¥7,934 million in FY2024 → ¥7,846 million in FY2025 → ¥8,333 million in FY2026. However, operating profit has remained sluggish, moving from ¥35 million in FY2022 → ¥113 million in FY2023 → -¥13 million in FY2024 → ¥19 million in FY2025 → -¥188 million in FY2026. In FY2026, although revenue increased on higher sales of Marine Internal Combustion Engines (Main Engines) and Parts & Repair Work, external factors—namely sharp increases in raw materials, purchased goods, and various expenses—caused the cost ratio to deteriorate significantly. Net income of ¥186 million was a one-off result dependent on gains from the sale of held shares (extraordinary income of ¥215 million), while ordinary income from core operations remained as low as ¥9 million. It should also be noted that inventories increased by ¥1,014 million, with a buildup of work-in-process putting pressure on working capital.
Growth Strategy
Revenue structure reform through order expansion, price pass-through, cultivation of new businesses, and response to next-generation fuels
The Company continues to pursue pass-through of rising costs for materials and equipment into sales prices, while actively pursuing order-taking activities both domestically and overseas. The order backlog at the end of FY2026 (ending March 2026) stood at ¥6,109 million (up 48.9% year on year), and the foundation for sales growth is steadily being established.
To offset fluctuations in earnings from main engine sales, the Company continues its ongoing efforts to expand orders for parts supply and repair work related to previously delivered engines. Sales of Parts & Repair Work increased again in the current period, functioning as a revenue pillar that complements the main engine business.
Inquiries for overseas projects, particularly from the Asia region, have been on an increasing trend, and the Company is actively pursuing order-taking activities. Against the backdrop of the yen's depreciation, improved competitiveness in the international shipping sector is expected. The weaker yen is serving as a tailwind as an external factor.
The Company is cultivating the lubricating oil purification equipment business and the biodiesel fuel manufacturing and sales business as new sources of revenue, aiming to reduce dependence on the main engine business and diversify earnings. These businesses are currently still in the cultivation stage, and their contribution to performance remains limited.
Toward the realization of a decarbonized society, the Company continues to promote the development of next-generation fuel engines and low-fuel-consumption new engines. It is also advancing system development toward the practical application of autonomous vessel navigation, aiming to respond to tightening environmental regulations and secure medium- to long-term competitiveness.
Last updated: July 19, 2026