The main explanation for this wage gap is that women are more likely to have part-time jobs.
"Judging from the Swedish debate about salaries, one would think that women are starting to catch up, but that's because women's part-time wages tend to be converted to their full-time equivalents before the stats are presented," the Trade Union Confederation head Karl-Petter Thorwaldsson tells Swedish Radio News.
When you look at actual salaries - what ends up in women's and men's pockets - there are big differences, claims Thorwaldsson, who says women earn 73 percent less than men.
Thorwaldsson also insisted that men's and women's work are judged differently and that goes for all sectors, he insists.
"This is the most medieval phenomenon we have left in Sweden, that there is such a big difference between how we treat men's and women's jobs and it happens in all fields and in all sectors," says Thorwaldsson.
The latest income statistics published in Sweden are from 2014. Since then, many municipalities and county councils have begun to offer employees the right to full-time work.
Thorwaldsson believes the gender wage gap will soon narrow.
"I do believe we will catch up and that women's wages will increase but so far it hasn't happened," says Thorwaldsson.