Abstract: The present invention provides an electric card fastener with elastic metal cantilever, configured to a circuit board, for fastening an electric card. The electric card fastener is formed by a corresponding mounted base. The mounted base includes a cantilever with a restricted portion disposed along and a mounted portion on the button, connecting with one end of the cantilever. After the connection of the cantilever and the mounted portion, the cantilever is elastic for backward and forward movement. Whereby, the electric card fastener fastens the electric card in a predetermined position for preventing poor electrical connection and strengthening the construction of components of the present invention for improving support ability, and the fastening components are used as a short cut for the grounding circuit on the electric card to connect ground.