財務会計基準機構会員マーク
2026年2月10日
各　位
上場会社名東亜ディーケーケー株式会社
代表者代表取締役社長高橋　俊夫
（コード番号6848
0
）
問合せ先責任者執行役員　経営戦略部長安孫子　正美
（TEL03-3202-0211）
業績予想の修正に関するお知らせ
当社は、最近の業績の動向等を踏まえ、2025年５月13日に公表した2026年３月期（2025年 ４月１日～2026年３月31日）の通期業績予想を下記のとおり修正しましたので、お知らせいたします。なお、今回の業績予想の修正に伴う期末配当予想の修正はありません。
記
●業績予想の修正について
2026年3月期通期連結業績予想数値の修正（2025年4月1日～2026年3月31日）
売上高営業利益経常利益親会社株主に帰属する当期純利益1株当たり当期純利益
百万円百万円百万円百万円円 銭
前回発表予想(A)18,5001,5161,5841,16058.70
今回修正予想(B)1,73551058084642.80
増減額(B-A)△665△1,006△1,004△314
増減率(%)△3.6△66.4△63.4△27.1
（ご参考）前期実績
（2025年3月期）		18,0581,3381,4741,11356.36
修正の理由
　売上高については、国内半導体工場建設計画の先送りや国内外の公共設備需要が当初見込みより軟調に推移したこと、中国における環境水質計の販売が想定を大幅に下回ったことなどから、前回発表予想を下回る見通しです。
　また、競争力強化に向けた研究開発の推進に伴う開発費の増加に加え、労務費や原材料費の高騰、更にはコロナ禍の混乱に伴う長期滞留在庫の評価損計上により売上原価率が上昇し、各段階利益はいずれも計画を下回る見通しとなりました。

（注）上記の予想につきましては、本資料の発表日現在において入手可能な情報に基づき作成したものであり、実際の業績は様々な要因により異なる結果となる可能性があります。
●配当予想の修正について
年間配当金
第1四半期末第2四半期末第3四半期末期末合計
円 銭円 銭円 銭円 銭円 銭
前回予想
（―年―月―日発表）		―――――
今回修正予想―――――
当期実績―――
前期実績
（2025年3月期）		―――――
修正の理由
以　上
2026-03-31684802024-04-012025-03-31tse-ed-t:ConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802024-04-012025-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802024-04-012025-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802024-04-012025-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802024-04-012025-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802024-04-012025-03-31tse-ed-t:AnnualMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802025-04-012026-03-31684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:ConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:FirstQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:SecondQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ResultMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:ThirdQuarterMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:YearEndMembertse-ed-t:NonConsolidatedMembertse-ed-t:PreviousMembertse-ed-t:UpperMember684802025-04-012026-03-31tse-ed-t:AnnualMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:ForecastMember684802025-04-012026-03-31tse-ed-t:AnnualMembertse-ed-t:NonConsolidatedMembertse-ed-t:CurrentMembertse-ed-t:LowerMember684802025-04-012026-03-31tse-ed-t:AnnualMembertse-ed-t:NonConsolidatedMembertse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