The Jakarta-based Corruption Eradication Commission, known as KPK, has arrested a Japanese businessman in a bribery case involving an Indonesian judge, the antigraft body's spokesman said Sunday.

The KPK had earlier declared Toshio Shiokawa, director of electric wire producer PT Onamba Indonesia, a suspect in a bribery case involving Imas Dianasari, an ex-judge at the Ad-Hoc Court in charge of Industrial Relations in the West Java provincial capital of Bandung.

"KPK has arrested suspect (Toshio Shiokawa) . . . for 20 days, starting from (May 11) at the Cipinang Detention Center in East Jakarta," KPK spokesman Johan Budi said.

The period of arrest can be extended if deemed necessary.

In January, the ex-judge was found guilty of taking bribes and was sentenced to six years in prison by the Bandung Corruption Court. The court also ordered her to pay 200 million rupiah ($21,796) in fines.

Imas, then a judge at the court, was convicted of taking 352 million rupiah in bribes for delivering a verdict in April 2011 in favor of PT Onamba Indonesia, which faced a lawsuit over the firing of 176 workers.

She was also caught accepting 200 million rupiah from Odih Juanda, PT Onamba Indonesia's human resources development manager, at a restaurant in Cileunyi, West Java, for an agreement that she would influence the decision of the Supreme Court.