Masaaki Koike

is a Japanese politician of the Liberal Democratic Party, who serves as a member of the House of Representatives.

Early years On 18 September 1966, Koike was born in Narita, Chiba Prefecture. He graduated from the College of Science and Technology at Nihon University and completed his master's degree at its Graduate School of Science and Technology.

Political career In 1995, Koike ran for the Narita City Council and won. He had served the office until 2011. In the 2024 general election, Fukuhara defeated CDP's Hajime Yatagawa by a narrow margin and was elected for the first time.

In the 2026 general election, he defeated CRA's Yatagawa by a wide margin.