The average monthly wage, including bonuses, came to 314,150 yen in 2013, a record low for the second straight year since the current survey method was introduced in 1990, the labor ministry said in a preliminary report Wednesday.
Overtime pay and bonuses grew on the back of an economic upturn, but low-paid part-timers accounted for a greater share of the overall workforce, preventing the average wage level from rising, according to the Ministry of Health, Labor and Welfare.
Part-timers accounted for a record 29.4 percent of the workforce, up 0.6 point from the previous year.
The average monthly wage of full-time workers turned up for the first time in two years, rising 0.7 percent to 404,743 yen, while that of part-timers fell for the first time in two years, coming to 96,630 yen, down 0.6 percent, the ministry said.
The nationwide survey was conducted on around 33,000 firms with five or more employees.