Aska -- who is part of the popular music duo Chage and Aska -- was given a three year prison term, suspended for four years, after being found guilty of using stimulants and MDMA -- commonly known as ecstasy.
He was also convicted of possessing synthetic narcotics.
Aska, 56, whose real name is Shigeaki Miyazaki, had initially denied the allegations and rejected news reports that he was a drug addict.
But later he admitted the charges and reportedly told investigators that he obtained the narcotics from gangsters.
Possession and use of drugs in Japan is heavily regulated and the police make much of high-profile arrests.
Aska's conviction comes after the 2009 fall from grace of pop star Noriko Sakai, whose fan base stretched across East Asia. Her clean-cut image was destroyed after she was successfully prosecuted for drug use.