[1][2] After graduating , Shoriki joined the Home Ministry in 1913 and worked at the Tokyo Metropolitan Police Department, rising high in the ranks.

[3][4] After the Toranomon Incident, an assassination attempt on the Prince Regent Hirohito on 27 December 1923, Shoriki resigned assuming responsibility together with Superintendent General of Tokyo Metropolitan Police Kurahei Yuasa.

[3] In 1924, with Home Minister Viscount Shinpei Goto providing funds, Shoriki bought the bankrupt newspaper Yomiuri Shimbun and became its president.

In 1950, Shōriki oversaw the realignment of the Japanese Baseball League into its present two-league structure and the establishment of the Japan Series.

After the surrender of Japan, Shōriki was arrested by the Supreme Commander for the Allied Powers as a "Class A" war criminal due to his proximity to the wartime regime, spending 21 months in the Sugamo Prison.

In July 1952, just three months after the US occupation bureaucracy had formally ended, Shōriki was granted a broadcasting license for the new Nippon Television Network (NTV) by Japanese media regulators.

[6] In 1957, he joined the first Kishi cabinet as chairman of the National Public Safety Commission, and around the same time, the Japanese government entered into a contract to purchase 20 nuclear reactors from the United States of America.

"[3] In 2006, Tetsuo Arima, a professor specialising in media studies at Waseda University in Tokyo, published an article that proved Shōriki acted as an agent under the codenames of "podam" and "pojackpot-1" for the CIA to establish a pro-US nationwide commercial television network (NTV) and to introduce nuclear power plants using U.S. technologies across Japan.

Arima's accusations were based on the findings of de-classified documents stored in the NARA in Washington, D.C.[8] Shōriki died on October 9, 1969, in Atami, Shizuoka.