During his affiliation with AJPW, he also served as the chairman for the Pacific Wrestling Federation (PWF), which is the governing body for all championships in the promotion.

He then became a teacher of classic Japanese literature in a high school in Ishikawa Prefecture, before pursuing a professional wrestling career in 1985.

In June 1989, Hase and Takayuki Iizuka went to the Soviet Union to be trained in sambo, where he learned one of his signature moves, the uranage.

Hase and Muto won the Super Grade Tag League in November 1993, defeating The Jurassic Powers in the final.

In 2000, he founded the multi-promotional Bad Ass Translate Trading stable with Keiji Muto, Taiyō Kea and Jinsei Shinzaki; Hase and Muto reformed their team to battle Jun Akiyama and Yuji Nagata on October 8, the rising stars of their respective promotions (NOAH and NJPW), and were defeated in a ceremonial passing of the torch match that highlighted the advancement of professional wrestling in Japan.

He tagged with Katsuhiko Nakajima and Satoshi Kojima to face Taru, Suwama and "brother" Yasshi of the Voodoo Murderers.

The match was originally supposed to have Kensuke Sasaki in it to team with Hase and Kojima, but he was replaced with Nakajima following an eye injury.

Sasaki was still a presence in the match, working ringside to keep Voodoo Murders' heelish antics at bay and entering the ring at one point.

[1] On August 5, 2018, Hiroshi Hase was revealed as the special partner of Riki Choshu and Jun Akiyama on an All Japan show, victorious against Naoya Nomura, Yoshitatsu and Kazma Sakamoto.

Since then, Hase has made two one-off appearances for Pro Wrestling NOAH, most recently on January 1, 2023, teaming up with Kazuyuki Fujita, Nosawa Rongai and Kendo Kashin in a winning effort against Masakatsu Funaki, Katsuhiko Nakajima, Manabu Soya and Hajime Ohara.

[5][10] He is a defender of the Hague Convention and supports legislation intended to ensure visitation rights between children and their parents separated through divorce or other marital disputes in Japan.

[4] He replaced Hakubun Shimomura, who stepped down from the post after being accused of mishandling the main stadium project for the 2020 Summer Olympics in Tokyo.

[12] In April 2020, Hase was accused of "patronizing, sexist behavior and harassment" at the Tsubomi Cafe in Shibuya, Tokyo.

In the report, it was outlined that, along with fellow constituents of the Liberal Democratic Party, Hase had been using aggressive behavior towards female staff members, many of which had been abused prior to employment with the cafe.

The association aligned with the cafe, Colabo, stated that Hase "touched [a woman's] waist with both his hands when she was working to set up a tent".

Aichi: Hideaki Ōmura Akita: Norihisa Satake Aomori: Sōichirō Miyashita Chiba: Toshihito Kumagai Ehime: Tokihiro Nakamura Fukui: Tatsuji Sugimoto Fukuoka: Seitaro Hattori Fukushima: Masao Uchibori Gifu: Hajime Furuta Gunma: Ichita Yamamoto Hiroshima: Hidehiko Yuzaki Hokkaidō: Naomichi Suzuki Hyōgo: Motohiko Saitō Ibaraki: Kazuhiko Ōigawa Ishikawa: Hiroshi Hase Iwate: Takuya Tasso Kagawa: Toyohito Ikeda Kagoshima: Kōichi Shiota Kanagawa: Yūji Kuroiwa Kōchi: Seiji Hamada Kumamoto: Takashi Kimura Kyoto: Takatoshi Nishiwaki Mie: Katsuyuki Ichimi Miyagi: Yoshihiro Murai Miyazaki: Shunji Kōno Nagano: Shuichi Abe Nagasaki: Kengo Oishi Nara: Makoto Yamashita Niigata: Hideyo Hanazumi Ōita: Kiichiro Satō Okayama: Ryuta Ibaragi Okinawa: Denny Tamaki Osaka: Hirofumi Yoshimura Saga: Yoshinori Yamaguchi Saitama: Motohiro Ōno Shiga: Taizō Mikazuki Shimane: Tatsuya Maruyama Shizuoka: Yasutomo Suzuki Tochigi: Tomikazu Fukuda Tokushima: Masazumi Gotoda Tokyo: Yuriko Koike Tottori: Shinji Hirai Toyama: Hachiro Nitta Wakayama: Shūhei Kishimoto Yamagata: Mieko Yoshimura Yamaguchi: Tsugumasa Muraoka Yamanashi: Kotaro Nagasaki