TOKYO — A member of Japan’s Parliament was arrested Wednesday on suspicion of taking bribes from a company that wanted to build one of the first casinos in Japan, which legalized them just three years ago.

Prosecutors arrested the lawmaker, Tsukasa Akimoto, of the governing Liberal Democratic Party, on allegations of accepting about $34,000 in cash and other gifts from the company, which was not identified in documents filed by prosecutors. Mr. Akimoto, who has yet to be formally charged, has denied wrongdoing.

Parliament legalized casino gambling in 2016 despite public opposition, and Mr. Akimoto’s arrest could be a blow to the nascent industry. Lawmakers put significant restrictions on casino licensing to address concerns about the potential for money laundering and gambling addiction, and no casinos have yet opened.

Documents filed by prosecutors outline a plan by three men associated with the unnamed company to secure Mr. Akimoto’s help with its project — building a casino on the northern island of Hokkaido — in exchange for gifts. All three men have been arrested.