An electric fan has a driving assembly, a stand and an impeller assembly being connected to and being driven by the driving assembly. The driving assembly has a positioning panel having multiple indentations and two connectors being formed on the positioning panel. The stand is mounted into the driving assembly and around the connector of the driving assembly and has at least two resilient positioning protrusions engage two of the indentations of the driving assembly. With the at least two positioning protrusions engaging different indentations, the driving assembly and the impeller assembly are pivoted and are held in different angles. Therefore, the angle of the impeller assembly is easily adjusted.