To provide a weft inserting device designed to smoothly bring a weft into the starting end of a weft guide passage while avoiding the problems of selvedge length and processing easiness.

An introductory guide passage 19 provided on a dent 17 is made up of a horizontal upper wall surface, perpendicular deep wall surface and lower wall surface. These surfaces are so designed as to go away toward the side of an introductory guide passage 131 as they go for weft insertion starting side, i.e., weft inserting main nozzles 111, 112, 113 side, and the diameter of an introductory guide hole passage 19 is set larger toward the weft insertion starting side. The edge face shape at the introductory guide hole 19 on the weft guide passage 131 side virtually coincides with the shape of a guide groove 16.