Date of Birth: 
About Satoyama Kōsaku
- Satoyama Kosaku (born May 31, 1981) is a retired professional sumo wrestler from Oshima, Kagoshima Prefecture, Japan.
- A former amateur sumo champion at Nihon University, he entered professional sumo in 2004 and first reached the top makuuchi division in 2007.
- His highest rank was maegashira 12.
- He spent much of his career in the juryo and makushita divisions, and won a yusho or tournament championship in each.
- He won promotion back to the top division in 2014 after a seven-year and 37-tournament absence, the longest ever.
- He was a member of Onoe stable.
- He retired in November 2018 and is an elder of the Japan Sumo Association under the name of Sanoyama.
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