A winder for winding a web comprising: a front winding base frame and a rear winding base frame that are arranged oppositely with a prescribed spacing therebetween and are movable in a forward direction and a rearward direction, wherein winding arms (3A, 3B) that hold a winding shaft (4A, 4B) are attached to the front winding base frame and the rear winding base frame, respectively, so as to be capable of ascending and descending vertically, the winding arms (3A, 3B) are detachably attached so as to be capable of being exchanged between the front winding base frame and the rear winding base frame without interfering with each other characterized in that it further comprises: a front-side touch roller frame and a rear-side touch roller frame that correspond to the front winding base frame and the rear winding base frame, respectively, are provided under the front winding base frame and the rear winding base frame, the front-side touch roller frame that corresponds to the front winding base frame is fixed, and the rear-side touch roller frame that corresponds to the rear winding base frame is disposed so as to be capable of slidingly moving in a forward direction and a rearward direction, a touch roller (16A, 16B) is attached to each of the front-side touch roller frame and the rear-side touch roller frame so as to be capable of ascending and descending vertically, the touch rollers (16A, 16B) are detachably attached so as to be capable of being exchanged between the front-side touch roller frame and the rear-side touch roller frame without interfering with each other, and the winding shaft of the winding arm attached to the front winding base frame is passed on to the rear winding base frame while the touch roller attached to the front-side touch roller frame is in pressure contact with the winding shaft. a front winding base frame and a rear winding base frame that are arranged oppositely with a prescribed spacing therebetween and are movable in a forward direction and a rearward direction, wherein winding arms (3A, 3B) that hold a winding shaft (4A, 4B) are attached to the front winding base frame and the rear winding base frame, respectively, so as to be capable of ascending and descending vertically, the winding arms (3A, 3B) are detachably attached so as to be capable of being exchanged between the front winding base frame and the rear winding base frame without interfering with each other characterized in that it further comprises: a front-side touch roller frame and a rear-side touch roller frame that correspond to the front winding base frame and the rear winding base frame, respectively, are provided under the front winding base frame and the rear winding base frame, the front-side touch roller frame that corresponds to the front winding base frame is fixed, and the rear-side touch roller frame that corresponds to the rear winding base frame is disposed so as to be capable of slidingly moving in a forward direction and a rearward direction, a touch roller (16A, 16B) is attached to each of the front-side touch roller frame and the rear-side touch roller frame so as to be capable of ascending and descending vertically, the touch rollers (16A, 16B) are detachably attached so as to be capable of being exchanged between the front-side touch roller frame and the rear-side touch roller frame without interfering with each other, and the winding shaft of the winding arm attached to the front winding base frame is passed on to the rear winding base frame while the touch roller attached to the front-side touch roller frame is in pressure contact with the winding shaft. a front-side touch roller frame and a rear-side touch roller frame that correspond to the front winding base frame and the rear winding base frame, respectively, are provided under the front winding base frame and the rear winding base frame, the front-side touch roller frame that corresponds to the front winding base frame is fixed, and the rear-side touch roller frame that corresponds to the rear winding base frame is disposed so as to be capable of slidingly moving in a forward direction and a rearward direction, a touch roller (16A, 16B) is attached to each of the front-side touch roller frame and the rear-side touch roller frame so as to be capable of ascending and descending vertically, the touch rollers (16A, 16B) are detachably attached so as to be capable of being exchanged between the front-side touch roller frame and the rear-side touch roller frame without interfering with each other, and the winding shaft of the winding arm attached to the front winding base frame is passed on to the rear winding base frame while the touch roller attached to the front-side touch roller frame is in pressure contact with the winding shaft.