A parts supply apparatus includes a supply tray stacking portion where a supply tray containing parts is stacked; a tray raising/lowering unit for separating one of the supply trays from the supply tray stacking portion; a tray holding unit with which the tray raising/lowering unit is provided; and an empty tray stacking portion where an empty tray, which is the supply tray that is emptied after supply of the parts, is stacked. The empty tray stacking portion is disposed above the supply tray stacking portion in a vertical direction.