To provide a net-lifting auxiliary roller unit capable of safely conducting loading work of a fishing net in a short time, even in stormy weather, and capable of improving stability of a ship, and to provide a net-lifting method.

This net-lifting auxiliary roller unit 10 is arranged in an intermediate part of a tilting mast 13 of which the top is attached with a net-lifting machine 12 and guides the fishing net 14 lifted by the net-lifting machine 12, wherein the unit is equipped with a suspension support member 17 of which the top end 16 is coupled with the intermediate part of the tilting mast 13, a base member 19 which is tiltably attached to a bottom part of the suspension support member 17 through a support pin 18, a cylindrical roller main body 21, and side plates 22, 23 which are supported on both ends of the main body 21 and form a pair, further the unit is equipped with a flanged roller 24 which is rotatably attached to the base member 19 through a shaft part 20 in a cantilevered state and a hydraulic cylinder 25 of which the one end is attached to the suspension support member 17, and furthermore the unit has a link mechanism 25a which tilts the base member 19 to the suspension support member 17.