The jobless rate dropped to 3.2 percent from 3.3 percent in the previous month but remained above the three percent level recorded in May 2014, the State Secretariat for Economic Affairs (Seco) said in its monthly report on Tuesday.
The number of people registered for unemployment benefits at regional job placement centres fell in May by 4,782 from April to 136,349, Seco said.
The job seekers total declined to 192, 798, 6,548 fewer than in the previous month.
Unemployment among foreigners dipped to 6.1 percent from 6.4 percent, while edging downward to 2.2 percent from 2.3 percent for Swiss citizens.
The jobless rate was highest in the canton of Geneva (5.5 percent, unchanged), while the canton of Onwalden registered the lowest rate (0.9 percent, unchanged).
The rate in Zurich, Switzerland's largest job market, was 3.2 percent, down from 3.3 percent.
The canton of Valais recorded the biggest percentage drop in unemployment, falling to 3.8 percent from 4.3 percent.
For the full report (in French, German and Italian) check here.