A weft guide device in a jet loom having a reed carrier for carring a reed thereon is disclosed. The guide device made according to this invention generally comprises an array of weft guide members mounted on said reed carrier along the reed and each having a concave to provide a weft guide path, said concave being provided with a relatively narrow opening and defined by surfaces including a substantially vertically extending surface joining with said opening, and a surface opposite said substantially vertically extending surface through said concave.According to this invention, said opposite surface is inclined in a direction so that its upper portion is positioned nearer to said substantially vertically extending surface than is its lower portion.