He previously served as an independent Senator for Zlín district from October 2012 until his election to the Chamber of Deputies a year later.

[5][6] Tomio Okamura lived in Japan for the first ten years of his life before his mother returned with her sons to Czechoslovakia.

[7][8] He spent a part of his childhood in a children's home in Mašťov in the Ústí nad Labem Region, where he was severely bullied, causing him to have a stutter until the age of 22.

In 2013 he wrote two books – Umění přímé demokracie ("The Art of Direct Democracy") and Velká japonská kuchařka ("The Great Japanese Cookbook").

[11][12] In June 2012, Okamura, known previously as an advocate of direct democracy, announced his candidacy for the 2012 Czech Senate election as an independent candidate in Zlín.

[13] Okamura won in a run-off against Stanislav Mišák [cs], taking 66% of the vote and winning a seat in the Senate on 20 October 2012.

[16] His Senatorial term expired on his election to the Chamber of Deputies, after he had served in the Senate for one year and six days.

[20] In the 2013 parliamentary elections his party — Tomio Okamura's Dawn of Direct Democracy — obtained 342,339 votes (6.88%) and gained 14 seats.

[27] His younger brother, Osamu Okamura [cs], is an architect and university teacher, and also entered politics in 2023.