Among the index-heavy stocks, the worst were the heat-pump company Nibe and the measurement-technology group Hexagon, which lost 4.3 and 4.2 percent respectively.
The low risk appetite was also noticeable on the stock exchanges in Paris and Frankfurt, which both fell, while London went against the tide and rose slightly.
The price of North Sea oil (Brent) has risen about 3 percent to around $100 a barrel, as the bombings - condemned as a ceasefire violation by Iran - create new uncertainty about when gas and oil deliveries through the Strait of Hormuz can resume.
On the foreign exchange market, the dollar is rising.
The OMXS index rose 1.5 percent on Monday. Since the beginning of the year, the index has risen 5.5 percent.
