"It's strange that the children of the unemployed are not entitled to it," said Björklund.
The Liberal Party proposes the right for all children between the ages of one and six to attend pre-school for 30 hours a week. The idea is one of several proposals to be considered in a new party programme to be presented before the summer, reports news agency TT.
The liberals also want to change the pre-school curriculum so that learning plays a stronger role.
"Children at this age want to start learning numbers and letters. They are curious and want to learn more - they should at least be able to start with the foundations of reading," Björklund told delegates.
More pre-school teachers would be needed if the party's plans are to be implemented (if the government wins another election) and news agency TT reports that the whole package is estimated to cost between two to three billion Swedish crowns per year.