A web adhesive application device comprising: an adhesive liquid tank that stores adhesive liquid; an adhesive application roller that allows the adhesive liquid of the adhesive liquid tank to be applied to a surface thereof and transfers the adhesive liquid to an adhesive application region of a web; a doctor roller that adjusts a thickness of the adhesive liquid applied to the adhesive application roller to a preset thickness; and a scraping member that scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with a surface of the adhesive application roller on an upstream side of a nip portion between the adhesive application roller and the doctor roller in a rotational direction; characterized in that the web adhesive application device further comprises: a damming member that dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller on the upstream side of the nip portion between the adhesive application roller and the doctor roller in the rotational direction and on a downstream side of a contact position of the scraping member in the rotational direction; wherein the damming member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the damming member in a width direction corresponds to an end portion of the adhesive application region in the width direction, and the scraping member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the scraping member in the width direction corresponds to an end portion of the adhesive application region in the width direction or extends within the adhesive application region by a predetermined length. an adhesive liquid tank that stores adhesive liquid; an adhesive application roller that allows the adhesive liquid of the adhesive liquid tank to be applied to a surface thereof and transfers the adhesive liquid to an adhesive application region of a web; a doctor roller that adjusts a thickness of the adhesive liquid applied to the adhesive application roller to a preset thickness; and a scraping member that scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with a surface of the adhesive application roller on an upstream side of a nip portion between the adhesive application roller and the doctor roller in a rotational direction; a damming member that dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller on the upstream side of the nip portion between the adhesive application roller and the doctor roller in the rotational direction and on a downstream side of a contact position of the scraping member in the rotational direction; wherein the damming member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the damming member in a width direction corresponds to an end portion of the adhesive application region in the width direction, and the scraping member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the scraping member in the width direction corresponds to an end portion of the adhesive application region in the width direction or extends within the adhesive application region by a predetermined length.