Blower

A blower comprising:

• a prime mover;
• a fan configured to be driven by the prime mover;
• a blower duct formed as a straight tube portion through which an airflow generated by the fan flows in a frontward direction from a rear toward a front of the straight tube portion;
• a plate portion disposed inside the blower duct and having an upper side surface and a lower side surface extending along the frontward direction in which the airflow flows;
• and
• a protrusion protruding from at least one of the upper side surface and the lower side surface in an up-down direction orthogonal to the frontward direction in which the airflow flows, and extends in a right-left direction along the at least one of the upper side surface and the lower side surface, wherein the protrusion protrudes only from a downstream edge of the at least one of the upper side surface and the lower side surface,
• wherein a height of the protrusion in the up-down direction is within a range of 1% to 50% of a thickness of the plate portion in the up-down direction and a width of the protrusion in the frontward direction is within a range of 1% to 50% of a minimum width of the plate portion in the frontward direction.