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1998 was the year in which Hello! Project was created. It is also the year when the 2nd generation of Morning Musume joined, Nakazawa Yuko debuted as a soloist, and Tanpopo was formed.

Members

• January 26: The Morning Musume and Heike Michiyo fanclub Hello! is created.
• May 3: Yasuda Kei, Yaguchi Mari, and Ichii Sayaka join Morning Musume as the second generation.
• October 18: Tanpopo is formed.

Birthdays

• April 3: Otsuka Aina is born.
• April 6: Katsuta Rina is born.
• May 14: Horie Kizuki is born.
• May 28: Sayashi Riho is born.
• June 12: Murota Mizuki is born.
• July 28: Okamura Rise is born.
• August 5: Suzuki Kanon is born.
• August 28: Mikame Kana is born.
• October 30: Tamura Meimi is born.
• November 5: Ogata Risa is born.
• November 24: Yamagishi Riko is born.
• December 1: Miyamoto Karin is born.
• December 30: Uemura Akari is born.

Singles

• January 28: Morning Coffee - Morning Musume (major debut)
• February 15: Sotsugyou ~TOP OF THE WORLD~ - Heike Michiyo
• May 27: Summer Night Town - Morning Musume
• July 1: Daikirai - Heike Michiyo
• August 5: Karasu no Nyoubou - Nakazawa Yuko (debut)
• September 9: Daite HOLD ON ME! - Morning Musume
• October 25: Dakedo Aishisugite - Heike Michiyo
• November 18: Last Kiss - Tanpopo (debut)
• December 2: Odaiba Moonlight Serenade - Nakazawa Yuko & Takayama Gen

Albums

• March 25: Teenage Dream - Heike Michiyo (debut)
• July 8: First Time - Morning Musume (debut)
• September 30: Morning Cop ~Daite HOLD ON ME!~ (soundtrack)
• December 12: Nakazawa Yuko Dai Isshou - Nakazawa Yuko (debut)

LDs/VHSs

• September 2: Morning Cop ~Daite HOLD ON ME!~
• December 12: Hello! FIRST LIVE AT SHIBUYA KOHKAIDO

Concerts

• July 12 - July 27: Hello! FIRST LIVE AT SHIBUYA KOHKAIDO

Auditions

• March 22: Morning Musume Tsuika Audition broadcast
• November 22: Geinoujin Shin Unit Audition announced

Anniversaries

• September 14: Morning Musume's major debut 1st anniversary.