A blower (1, 2, 3, 5, 6, 7) comprising: a duct (8, 10, 20) including an inlet (11, 21) and an outlet (12, 22); and a plurality of blades (30, 40) arranged in the duct (8, 10, 20), the plurality of blades (30, 40) spaced a regular distance from each other in a vertical direction, each of the plurality of blades (30, 40) including: a first part (31, 41) having a thickness decreasing in a direction toward the inlet (11, 21), a second part (32, 42) having a thickness decreasing in a direction toward the outlet (12, 22), and a third part (33, 43) formed between the first part (31, 41) and the second part (32, 42), the third part (33, 43) including an airflow generator (50, 60), wherein the airflow generator (50, 60) includes: a first electrode (51, 61), a second electrode (52, 62), and a dielectric (53, 63), wherein the airflow generator (50, 60) generates airflow (39, 49) in a direction from the inlet (11, 21) to the outlet (12, 22) when a voltage is applied between the first electrode (51, 61) and the second electrode (52, 62), and wherein the duct (8, 10, 20) includes a catalyst applied to an inner surface of the duct (8, 10, 20) that is closer to the outlet (12, 22) than the airflow generator (50, 60), the catalyst configured to adsorb and decompose ozone. a duct (8, 10, 20) including an inlet (11, 21) and an outlet (12, 22); and a plurality of blades (30, 40) arranged in the duct (8, 10, 20), the plurality of blades (30, 40) spaced a regular distance from each other in a vertical direction, each of the plurality of blades (30, 40) including: a first part (31, 41) having a thickness decreasing in a direction toward the inlet (11, 21), a second part (32, 42) having a thickness decreasing in a direction toward the outlet (12, 22), and a third part (33, 43) formed between the first part (31, 41) and the second part (32, 42), the third part (33, 43) including an airflow generator (50, 60), wherein the airflow generator (50, 60) includes: a first electrode (51, 61), a second electrode (52, 62), and a dielectric (53, 63), wherein the airflow generator (50, 60) generates airflow (39, 49) in a direction from the inlet (11, 21) to the outlet (12, 22) when a voltage is applied between the first electrode (51, 61) and the second electrode (52, 62), and wherein the duct (8, 10, 20) includes a catalyst applied to an inner surface of the duct (8, 10, 20) that is closer to the outlet (12, 22) than the airflow generator (50, 60), the catalyst configured to adsorb and decompose ozone. a first part (31, 41) having a thickness decreasing in a direction toward the inlet (11, 21), a second part (32, 42) having a thickness decreasing in a direction toward the outlet (12, 22), and a third part (33, 43) formed between the first part (31, 41) and the second part (32, 42), the third part (33, 43) including an airflow generator (50, 60), wherein the airflow generator (50, 60) includes: a first electrode (51, 61), a second electrode (52, 62), and a dielectric (53, 63), wherein the airflow generator (50, 60) generates airflow (39, 49) in a direction from the inlet (11, 21) to the outlet (12, 22) when a voltage is applied between the first electrode (51, 61) and the second electrode (52, 62), and wherein the duct (8, 10, 20) includes a catalyst applied to an inner surface of the duct (8, 10, 20) that is closer to the outlet (12, 22) than the airflow generator (50, 60), the catalyst configured to adsorb and decompose ozone. a first electrode (51, 61), a second electrode (52, 62), and a dielectric (53, 63), wherein the airflow generator (50, 60) generates airflow (39, 49) in a direction from the inlet (11, 21) to the outlet (12, 22) when a voltage is applied between the first electrode (51, 61) and the second electrode (52, 62), and wherein the duct (8, 10, 20) includes a catalyst applied to an inner surface of the duct (8, 10, 20) that is closer to the outlet (12, 22) than the airflow generator (50, 60), the catalyst configured to adsorb and decompose ozone.