Abstract: An expansion card has a terminal block, a top metal sheet, bottom metal sheet and a plastic seat. Two step retainers are formed respectively on two short edges of the terminal block. Two pairs of hooks are formed on the two long edges adjacent respectively to front and rear ends of the bottom metal sheet. The hooks of one pair hook respectively on the step retainers. The two long edges of the top metal sheet both extend to form Two bent portions are formed respectively on the long edges of the bottom metal sheet. The plastic seat is engaged with the top and bottom metal sheet. Fabrication of the expansion card is easy and convenient.