To engage the can lids sent in a stacked state with a separator roll for separating by small pressing force.

The can lids 1 are sent in the stacked state via a passage (2) inclined at a predetermined angle, the lower end of the lid is engaged with a separator knife (5) of the upper side of the separator roll (4) provided at a rotary shaft (3) disposed substantially parallel to the angle of the passage (2) to be brought into linear contact with the edge of the lid of the can so that the flange of the lid may not be damaged and worn powder may not be mixed in a seamed product.