To surely cross a weft over the back of a movable blade, turn back the weft, guide the weft between the blade line of the movable blade and the blade line of another blade and subsequently cut the weft.

A guide bar 30 attached to a support bracket 22 is provided with an introduction edge 301 and a guide edge 302. In a state that an opening between the blade line 211 of the fixed blade 21 and the blade line 272 of a movable blade 27 is maximum, the introduction edge 301 crosses the blade line 272 of the movable blade 27 on the view where the fixed blade 21 is overlapped on the movable blade 27. The guide edge 302 is inclined to the blade line 211 of the fixed blade 21 on the view where the fixed blade 21 is overlapped on the movable blade 27, and linked to the introduction edge 301.