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 (L15) 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 (P0) 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 (P2) that is separated by 2000 mm ahead of the blower from the blow-out port , a reference height range (R10) is defined as a range, in an up-down direction, starting at the reference point (P0) and ending at a position that is separated by 1600 mm upward from the reference point (P0), among three ranges obtained by trisecting, into three equal parts, the reference height range (R10) in the up-down direction, a first range (R11) is defined as a range positioned on an upper side, a second range (R12) is defined as a range positioned on a lower side, and a third range (R13) 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 (Q) 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 (R11) and an average airflow speed in the second range (R12) are approximately equal to each other and so that a ratio of an average airflow speed in the third range (R13) to the average airflow speed in the first range (R11) 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 (L15) 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 (P0) 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 (P2) that is separated by 2000 mm ahead of the blower from the blow-out port , a reference height range (R10) is defined as a range, in an up-down direction, starting at the reference point (P0) and ending at a position that is separated by 1600 mm upward from the reference point (P0), among three ranges obtained by trisecting, into three equal parts, the reference height range (R10) in the up-down direction, a first range (R11) is defined as a range positioned on an upper side, a second range (R12) is defined as a range positioned on a lower side, and a third range (R13) 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 (Q) 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 (R11) and an average airflow speed in the second range (R12) are approximately equal to each other and so that a ratio of an average airflow speed in the third range (R13) to the average airflow speed in the first range (R11) is less than 1.5. <EOS>