| 1893 |
三菱合資会社を設立 |
| 1893 |
Mitsubishi Goshi Kaisha is established. |
| 1918 |
三菱鉱業（株）を設立 |
| 1918 |
Mitsubishi Mining Company Ltd. is established. |
| 1920 |
苅田工場（現九州工場苅田第一地区、当時豊国セメント（株））設置、セメント生産を開始 |
| 1920 |
Kanda Plant (now Kyushu Plant Kanda District 1, then Hokoku Cement Corporation) commences cement production. |
| 1921 |
三菱鉱業（株）が東京株式取引所に株式上場 |
| 1921 |
Mitsubishi Mining Company Ltd., lists on the Tokyo Stock Exchange. |
| 1923 |
宇部セメント製造（株）設立 |
| 1923 |
Ube Cement Production, Ltd. is established. |
| 1925 |
宇部セメント製造（株） セメント生産を開始 |
| 1925 |
Ube Cement Production, Ltd. commences cement production. |
| 1936 |
わが国初のセメントタンカー「清忠丸」就航 |
| 1936 |
Japan’s first bulk cement tanker, Kiyotada Maru, is launched. |
| 1943 |
宇部セメント工場（現山口工場宇部地区）で高炉セメントの製造開始 |
| 1943 |
Ube cement plant (now Yamaguchi Plant Ube District) under construction commences production of portland blast-furnace cement. |
| 1948 |
伊佐採石所（現伊佐鉱山）石灰石採石を開始 |
| 1948 |
Isa Quarry (now Isa Mine) commences quarrying of limestone. |
| 1949 |
東京証券取引所上場 |
| 1949 |
Ube Industries, Ltd. lists on the Tokyo Stock Exchange. |
| 1952 |
筑豊石灰工業（株）設立（後に三菱セメントと合併、現東谷鉱山） |
| 1952 |
Chikuho Sekkai Kogyo Co., Ltd. is established (later merged with Mitsubishi Cement Corp; now Higashitani Mine). |
| 1954 |
三菱セメント（株）設立 |
| 1954 |
Mitsubishi Cement Corp. is established. |
| 1955 |
東谷鉱山開発開始 |
| 1955 |
黒崎工場（現九州工場黒崎地区）設置 |
| 1955 |
宇部セメント工場伊佐工場（現山口工場伊佐地区）設置 |
| 1955 |
Development of Higashitani Mine commences. |
| 1955 |
Kurosaki Plant (now Kyushu Plant Kurosaki District) commences cement production. |
| 1955 |
Ube Cement Plant’s Isa Plant (now Yamaguchi Plant Isa District) commences cement production. |
| 1958 |
岩手工場設置（当時東北開発（株）） |
| 1958 |
Iwate Plant (then Tohoku Kaihatsu Co., Ltd.) commences cement production. |
| 1959 |
宇部コンクリート工業（株）（現関東宇部コンクリート工業（株））設立 |
| 1959 |
Ube Concrete Industry Co., Ltd. (now Kanto UBE Concrete Corporate) is established. |
| 1964 |
苅田セメント工場（現九州工場苅田第二地区）設置 |
| 1964 |
苅田鳥帽子山開発開始 |
| 1964 |
Kanda Cement Plant (now Kyushu Plant Kanda District 2) commences cement production. |
| 1964 |
Development of Mt. Eboshi, Kanda commences. |
| 1969 |
横瀬工場設置 |
| 1969 |
Yokoze Plant commences cement production. |
| 1973 |
三菱鉱業（株）、三菱セメント（株）、豊国セメント（株）が3社合併し三菱鉱業セメント（株）発足 |
| 1973 |
菱光石灰工業（株）設立 |
| 1973 |
Mitsubishi Mining Co., Ltd., Mitsubishi Cement Corporation, and Hokoku Cement Corporation merge into Mitsubishi Mining & Cement Co., Ltd. |
| 1973 |
RYOKOLIME INDUSTRY Co., Ltd. is established. |
| 1977 |
40t積みホッパートレーラー 宇部・美祢高速道路で運転開始 |
| 1977 |
40‑tonne hopper trailer starts operating on Ube Mine Expressway. |
| 1979 |
青森工場設置 |
| 1979 |
Aomori Plant (then Tohoku Kaihatsu Co., Ltd.) commences cement production. |
| 1980 |
沖の山コールセンター（現宇部コールセンター）設置 |
| 1980 |
シンガポール駐在員事務所（現UBE Singapore Pte., Ltd.）開設 |
| 1980 |
Operations start at Okinoyama Coal Center (now Ube Coal Center). |
| 1982 |
興産道路（現宇部伊佐専用道路）全面開通 |
| 1982 |
14万5千kw石炭火力自家発電所設置 |
| 1982 |
Full route of Kosan Expressway opens. Operations start at 145-MW coal-fired power plant. |
| 1988 |
米国三菱セメント社設立 |
| 1988 |
MCCデベロップメント社設立 |
| 1988 |
ネバダレディミックス社買収 |
| 1988 |
Mitsubishi Cement Corp. is established in the United States. |
| 1988 |
MCC Development Corporation is established. |
| 1988 |
Nevada Ready Mix is established. |
| 1990-12-01 |
三菱金属（株）と三菱鉱業セメント（株）が合併し「三菱マテリアル（株）」として発足 |
| 1990-12-01 |
Mitsubishi Metal Corporation and Mitsubishi Mining & Cement Co., Ltd. merge to form Mitsubishi Materials Corporation on December 1. |
| 1991 |
東北開発（株）と合併 |
| 1991 |
Merges with Tohoku Kaihatsu Co., Ltd. |
| 1995 |
宇部興産海運（株）（現ＭＵアークライン（株））設立 |
| 1995 |
Ube Shipping & Logistics, Ltd.(now MU Arcline Corporation) is established. |
| 1997 |
宇部化学工業（株）とカルシードが合併し、宇部マテリアルズ（株）を設立 |
| 1997 |
Ube Chemical Ind. Co., Ltd. and CALCEED Co., Ltd. Merge to form Ube Material Industries, Ltd. |
| 1998 |
宇部三菱セメント（株）設立（包括的事業提携） |
| 1998 |
Forms comprehensive business tie-up with Ube Industries, Ltd. and establishes Ube-Mitsubishi Cement Corporation. |
| 2004 |
21万6千kWのIPP発電所設置 |
| 2004 |
Operations start at 216-MW IPP power plant. |
| 2012 |
MCCデベロップメント社がロバートソン・レディミックス社を完全子会社化 |
| 2012 |
MCC Development Corporation makes Robertson’s Ready Mix, Ltd. a wholly-owned subsidiary. |
| 2015 |
宇部興産建材（株）（現ＭＵマテックス（株））設立 |
| 2015 |
UBE Construction Materials Co., Ltd.(now MU MATEX Co., Ltd.) is established. |
| 2022-04-01 |
ＵＢＥ三菱セメント株式会社の営業開始 |
| 2022-04-01 |
Mitsubishi UBE Cement Corporation commences operations after integrating the cement and related businesses of both companies. |
