- Birth Name: Ariyasu Momoka (有安杏果)
- Nicknames: Momokaa~ (ももかぁ～), Ariyasu~ (ありやす～)
- Date of Birth: March 15, 1995
- Place of Birth: Saitama Prefecture, Japan
- Blood Type: A
- Bands / Groups:
Ariyasu got her start in show business with only one year old in 1996 when she became a model under the agency C&T. Then in 2004, she became a second generation member for the group Sister Rabbits while being a member of EXILE's EXPG academy.
She switched agencies in 2008 and went to her current agency, Stardust Promotion. In 2009, Ariyasu became a member for the idol group Power Age. However, several months later, the group disbanded and she decided to join Momoiro Clover.
It was announced on January 15, 2018 that Momoka would graduate from Momoiro Clover Z on January 21st.
- [2017.10.11] Kokoro no Oto (ココロノオト)
- [2016.07.03] Kokoro no Senritsu♪feel a heartbeat (ココロノセンリツ♪ feel a heartbeat)
-  Gin no Angel
-  Doyou Tokushuu Dorama Shijou no Koi ~Ai wa Umi wo Koete~
-  Suntory Mystery Taishou Special Toki no Nagisa
-  Getsuyou Mystery Gekijou Pet Sitter Sawaguchi Hanako no Jikenbo
-  Kayou Suspense Gekijou
-  SMAP x SMAP Tokubetsu Hen Saranheyo Ai no Gekijou no Ai no Uta "Kenbo Haseyo ~Shiawase ni Nare yo~"
-  Hamidashi Keiji Jonetsu Kei (ep. 359)
-  Kindaichi Shonen no Jikenbo SP
-  Okusama wa Keishi Sokan
-  Gakincho -Return Kids-
- [2004 ~ 2005] Ponki Kids 21
-  Hayashi Asuka - Chiisa Kimono
-  SMAP - Tomodachi e ~Say What You Will~
-  EXILE - Choo Choo Train
-  EXILE - Ginga Tetsudou 999
- Even though Ariyasu born in Saitama Prefecture, she can speak the Kansai dialect since her parents are Kansai natives.
- Since 1998 until 2009 she has appeared in more than 20 commercials.
- Hobby: Singing in the bathtub
- Skill: Dance