A jet flow discharge nozzle, comprising: a tubular partition wall; a tubular casing which covers an outer periphery of the tubular partition wall; a bifurcation which extends in an axial direction of the tubular partition wall and the casing so as to support downstream ends of the tubular partition wall and the casing from outside, inside the tubular partition wall being defined as a flow path for a high-speed core flow and a space between the tubular partition wall and the casing being defined as a flow path for a low-speed bypass flow; a pair of first projections (21; 22) provided at a downstream edge of the tubular partition wall near the bifurcation at positions symmetric about the bifurcation, each of the first projections being inclined to make an acute angle with the axial direction from an upstream side toward a downstream side; and a plurality of second projections (31; 32; 33) disposed at intervals along a peripheral direction downstream edge of the tubular partition wall, each of the second projections being inclined to make an acute angle with the axial direction from an upstream side toward a downstream side and protruding toward peripheral direction inside and/or outside of the tubular partition wall wherein the downstream edge of the tubular partition wall is divided into a first side of the bifurcation and a second side (b) opposite to the bifurcation by an imaginary line segment which is perpendicular to a center line of the bifurcation and passing through the center of the tubular partition wall, characterized in that a number of the first and second projections (21; 22; 31; 32; 33) which are located at the first side of the bifurcation is greater than that of the first and second projections (21; 22; 31; 32; 33) which are located at the second side (b) opposite to the bifurcation. a tubular partition wall; a tubular casing which covers an outer periphery of the tubular partition wall; a bifurcation which extends in an axial direction of the tubular partition wall and the casing so as to support downstream ends of the tubular partition wall and the casing from outside, inside the tubular partition wall being defined as a flow path for a high-speed core flow and a space between the tubular partition wall and the casing being defined as a flow path for a low-speed bypass flow; a pair of first projections (21; 22) provided at a downstream edge of the tubular partition wall near the bifurcation at positions symmetric about the bifurcation, each of the first projections being inclined to make an acute angle with the axial direction from an upstream side toward a downstream side; and a plurality of second projections (31; 32; 33) disposed at intervals along a peripheral direction downstream edge of the tubular partition wall, each of the second projections being inclined to make an acute angle with the axial direction from an upstream side toward a downstream side and protruding toward peripheral direction inside and/or outside of the tubular partition wall wherein the downstream edge of the tubular partition wall is divided into a first side of the bifurcation and a second side (b) opposite to the bifurcation by an imaginary line segment which is perpendicular to a center line of the bifurcation and passing through the center of the tubular partition wall, characterized in that a number of the first and second projections (21; 22; 31; 32; 33) which are located at the first side of the bifurcation is greater than that of the first and second projections (21; 22; 31; 32; 33) which are located at the second side (b) opposite to the bifurcation.