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SEOUL, Feb. 4 (Xinhua) -- South Korean President Moon Jae-in's approval rating fell 3.5 percentage points over the week to 39.0 percent this week, a weekly poll showed on Thursday.

The approval score declined below 40 percent in three weeks, according to the Realmeter survey.

The negative assessment on Moon's conduct of state affairs rose 3.8 percentage points from a week earlier to 56.6 percent this week.

Support for Moon's ruling Democratic Party slipped 1.8 percentage points to 30.6 percent.

The main conservative opposition People Power Party garnered 32.3 percent of support this week, up 2.6 percentage points from the previous week.

The minor center-left Open Democratic Party won 6.8 percent of approval score, followed by the minor center-right People's Party with 6.3 percent and the minor progressive Justice Party with 4.5 percent each.

The results were based on a survey of 1,511 voters conducted from Monday to Wednesday. It had plus and minus 2.5 percentage points in margin of error with a 95-percent confidence level.