The target price for 95-octane petrol at manned stations is reduced by 10 öre to 17.49 kroner per litre, while the price of diesel is reduced by 20 öre to 17.99 kroner per litre.
The price of biodiesel, so-called HVO 100, is also reduced by 20 öre, which means a price of 21.29 kroner per litre.
Other fuel prices are left unchanged.
The decrease follows an increase earlier in the week, which followed a more expensive dollar and higher oil prices on the world market.
At the turn of the year, prices were sharply reduced as a result of reduced reduction obligations.