A blower for being provided on a side wall and having a wide mode, comprising: a casing in which a suction port and a blow-out port are formed; a fan provided in the casing; and an airflow adjusting mechanism configured to adjust a blow-out airflow that is a flow of air blown out from the blow-out port, wherein the blow-out port extends in a left-right direction of the blower, an extension of the blow-out port in a width direction perpendicular to an extension direction of the blow-out port is less than or equal to 300 mm, a reference point is defined as at least one point on the floor that is positioned in a range, in a front-back direction, starting at a first point (P 1) that is separated by 1000 mm ahead of the blower from the blow-out port and ending at a second point that is separated by 2000 mm ahead of the blower from the blow-out port, a reference height range is defined as a range, in an up-down direction, starting at the reference point and ending at a position that is separated by 1600 mm upward from the reference point, among three ranges obtained by trisecting, into three equal parts, the reference height range in the up-down direction, a first range is defined as a range positioned on an upper side, a second range is defined as a range positioned on a lower side, and a third range is defined as a range positioned at a center, the blower is configured such that, under a test condition, when provided on the side wall in such a way that a reference position of the blow-out port is a position that is separated by 2000 mm upward from a floor, the airflow adjusting mechanism adjusts, in the wide mode, the blow-out airflow so that an average airflow speed in the first range and an average airflow speed in the second range are approximately equal to each other and so that a ratio of an average airflow speed in the third range to the average airflow speed in the first range is less than 1.5. a casing in which a suction port and a blow-out port are formed; a fan provided in the casing; and an airflow adjusting mechanism configured to adjust a blow-out airflow that is a flow of air blown out from the blow-out port, wherein the blow-out port extends in a left-right direction of the blower, an extension of the blow-out port in a width direction perpendicular to an extension direction of the blow-out port is less than or equal to 300 mm, a reference point is defined as at least one point on the floor that is positioned in a range, in a front-back direction, starting at a first point (P 1) that is separated by 1000 mm ahead of the blower from the blow-out port and ending at a second point that is separated by 2000 mm ahead of the blower from the blow-out port, a reference height range is defined as a range, in an up-down direction, starting at the reference point and ending at a position that is separated by 1600 mm upward from the reference point, among three ranges obtained by trisecting, into three equal parts, the reference height range in the up-down direction, a first range is defined as a range positioned on an upper side, a second range is defined as a range positioned on a lower side, and a third range is defined as a range positioned at a center, the blower is configured such that, under a test condition, when provided on the side wall in such a way that a reference position of the blow-out port is a position that is separated by 2000 mm upward from a floor, the airflow adjusting mechanism adjusts, in the wide mode, the blow-out airflow so that an average airflow speed in the first range and an average airflow speed in the second range are approximately equal to each other and so that a ratio of an average airflow speed in the third range to the average airflow speed in the first range is less than 1.5.