Abstract: An upholstered seating furniture frame (4) comprises a seat frame part (6) and at least a first leg part (8) connectable to the seat frame part (6). The seat frame part (6) comprises a seat frame structure (14, 16, 18, 20) which is at least partly made from hollow tubes. At least one of the seat frame part (6) and the first leg part (8) comprises a supporting device (72). The supporting device (72) is adapted to align and hold the first leg part (8) mounted to the seat frame part (6) in a self-standing intermediate assembly state. At least one of the seat frame part (6) and the first leg part (8) comprises at least portions of a final connecting device (76, 78, 80, 38, 104) adapted for final connection of the first leg part (8) to the seat frame part (6) for transforming the self-standing intermediate assembly state into a self-standing ready-to-use state.