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2000 was the year in which Ishiguro Aya and Ichii Sayaka graduated Morning Musume and Hello! Project; the 4th generation joined Morning Musume; Maeda Yuki and Matsuura Aya joined Hello! Project; Miyoshi Chinatsu left Hello! Project; Sheki-Dol and Minimoni were formed; T&C Bomber disbanded; Chelsea and April left Coconuts Musume; and Lehua joined Coconuts Musume.

Members

• January 7: Ishiguro Aya graduates Morning Musume and Hello! Project
• January 3: Taiyou to Ciscomoon becomes T&C Bomber
• January 15: Lehua joins Coconuts Musume and Hello! Project
• January 30: Chelsea and April leave Coconuts Musume and Hello! Project
• April 12: Maeda Yuki joins Hello! Project
• April 16: Ishikawa Rika, Yoshizawa Hitomi, Tsuji Nozomi, and Kago Ai join Morning Musume as the 4th generation
• May 21: Ichii Sayaka graduates Morning Musume and Hello! Project
• May 30: Kimura Asami joins Country Musume
• June 4: Ishikawa Rika and Kago Ai join Tanpopo
• June 26: Yoshizawa Hitomi joins Petitmoni
• July 11: Sheki-Dol is formed
• August 29: Matsuura Aya joins Hello! Project
• October 9: T&C Bomber disbands
• October 22: Minimoni is formed
• October 31: Miyoshi Chinatsu leaves Hello! Project

Birthdays

• February 10: Nomura Minami is born
• February 19: Morito Chisaki is born
• March 27: Ogawa Rena is born
• April 1: Kishimoto Yumeno is born
• April 26: Hamaura Ayano is born
• June 24: Shimamura Uta is born
• July 21: Taguchi Natsumi is born
• August 16: Kobayashi Honoka  is born
• August 20: Shimakura Rika is born
• August 31: Inoue Hikaru is born
• September 3: Asakura Kiki is born
• September 10: Oura Hirona is born
• September 22: Satoyoshi Utano is born
• September 29: Ono Mizuho is born
• December 27: Wu Zhao Xian is born

Singles

• January 26: Koi no Dance Site - Morning Musume
• February 19: Amai Anata no Aji - Melon Kinenbi (debut)
• March 8:
  • Akai Nikkichou - Akagumi 4
  • Kiiroi Osora de BOOM BOOM BOOM - Kiiro 5
  • Aoi Sports Car no Otoko - Aoiro 7
• April 19: DON'T STOP Ren'aichuu - T&C Bomber
• April 21: Naki Usagi - Maeda Yuki (debut)
• April 27: Hokkaido Shalala - Country Musume
• May 17:
  • Happy Summer Wedding - Morning Musume
  • One Room Natsu no Koi Monogatari - Heike Michiyo
  • Tokonatsu Musume - Coconuts Musume
• May 31: Anata no Shirt to Love song - Miyoshi Chinatsu (last single)
• June 28: Kokuhaku Kinenbi - Melon Kinenbi
• July 5: Otome Pasta ni Kandou - Tanpopo
• July 12: Shanghai no Kaze - Nakazawa Yuko
• July 19: HEY! Mahiru no Shinkirou - T&C Bomber (last single)
• July 26:
  • Watashi mo "I LOVE YOU" - Coconuts Musume
  • Seishun Jidai 1.2.3! / Bicycle Daiseikou! - Petitmoni
• July 31: Koi ga Suteki na Kisetsu - Country Musume
• August 9: Ai no Chikara - Heike Michiyo
• September 6: I WISH - Morning Musume
• October 25: Super Jet Shoes ~Mirai wo Aruku Kutsu~ - Peachy (debut)
• November 1: Kokoro no Pheromone - Sheki-Dol (debut)
• December 6: Snow Paradise - Ishii Rika
• December 13: Ren'ai Revolution 21 - Morning Musume

Albums

• March 29: 3rd -LOVE Paradise- - Morning Musume
• April 26: Petit Best ~Ki Ao Aka~ - Hello! Project
• September 13: For ourself ~Single History~ - Heike Michiyo
• September 27: 2nd STAGE - T&C Bomber

Anniversaries

• January 28: Morning Musume's major debut 2nd anniversary
• September 14: Morning Musume's formation 3rd anniversary