The Supreme Court ruled Thursday that it is unreasonable for Japan Post Co. not to provide its fixed-term employees with the same allowances it pays to regular workers.

The top court's judgment in favor of nonregular workers came two days after it ruled against them in two other cases over a law that prohibits unreasonable gaps between the treatment of such employees and regular workers.

The court's No. 1 Petty Bench, presided over by Justice Atsushi Yamaguchi, addressed allowances widely paid in Japan to employees whose family members are financially dependent on them as well as extra pay for work during the year-end and New Year's holidays — the busiest season for the mail service due to greeting-card delivery.