PROBLEM TO BE SOLVED: To provide a spout and a pouch with a spout with a simple structure, which suppresses edge breakage of the film when the spout is thermally welded to the film. A spout (30) having a mounting portion (40) heat-welded to a film (21), wherein the mounting portion (40) has a plurality of welding flanges (42) formed to project from a base portion (41) to an outer peripheral side, Of the welding flanges 42 are arranged side by side in the up-down direction with the first gap portions 43 arranged between them, and the heat-welding surfaces 42a of the respective welding flanges 42 are located on both sides in the front-back direction and from the center side in the left-right direction to the outside. The flat portions 42c are formed on both sides in the left-right direction so as to be closer to the center side from the outer side in the front-back direction, and the vertical width of each welding flange 42 corresponds to the thickness dimension of the heat-welding layer 21a of the film 21. If so, spout 30 is set at 10.0 to 4.0t. [Selection diagram] Figure 2
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