A board card module including a case, a main board, and an expansion card is provided. The case has an accommodating space. The main board is fixed to the case and located in the accommodating space. The main board has a connecting port. The expansion card is detachably pivoted to the case and located in the accommodating space. The expansion card has a terminal set and the expansion card is rotatable relative to the case to insert the terminal set into or separate the terminal set from the connecting port.