An air-sending device of an outdoor unit comprising: a propeller fan that rotates about a rotation axis extending in a direction of gravity and includes a plurality of blades that produce a flow of gas in a direction opposite to the direction of gravity; and a bellmouth rectifying the gas, the bellmouth having an annular wall extending in a direction of rotation of the blades of the propeller fan on an outer side with respect to outer peripheral edges of the blades, wherein, the bellmouth has a wall forming a sloping surface extending such that an air passage on an outlet side spreads outward in a case where an operating point of the propeller fan is on an open side with respect to a surging zone, and the bellmouth has a shape satisfying condition represented as a relationship of L/L0 ≥ 0.5 between a length L in the direction of the rotation axis from an opening on the inlet side to the end of the sloping surface on the inlet side and a length L0 of the blades of the propeller fan in the direction of the rotation axis; and the air-sending device being characterized in that: the bellmouth has a shape further satisfying conditions represented as a relationship of H/D ≥ 0.04 between a length H of the sloping surface in a direction of the rotation axis from an end on an inlet side to an end on the outlet side and a fan diameter D of the propeller fan, and a relationship of 0 < θ ≤ 60° for an angle θ formed between a line connecting the ends of the sloping surface and the rotation axis. a propeller fan that rotates about a rotation axis extending in a direction of gravity and includes a plurality of blades that produce a flow of gas in a direction opposite to the direction of gravity; and a bellmouth rectifying the gas, the bellmouth having an annular wall extending in a direction of rotation of the blades of the propeller fan on an outer side with respect to outer peripheral edges of the blades, wherein, the bellmouth has a wall forming a sloping surface extending such that an air passage on an outlet side spreads outward in a case where an operating point of the propeller fan is on an open side with respect to a surging zone, and the bellmouth has a shape satisfying condition represented as a relationship of L/L0 ≥ 0.5 between a length L in the direction of the rotation axis from an opening on the inlet side to the end of the sloping surface on the inlet side and a length L0 of the blades of the propeller fan in the direction of the rotation axis; and the air-sending device being characterized in that: the bellmouth has a shape further satisfying conditions represented as a relationship of H/D ≥ 0.04 between a length H of the sloping surface in a direction of the rotation axis from an end on an inlet side to an end on the outlet side and a fan diameter D of the propeller fan, and a relationship of 0 < θ ≤ 60° for an angle θ formed between a line connecting the ends of the sloping surface and the rotation axis. the bellmouth has a shape further satisfying conditions represented as a relationship of H/D ≥ 0.04 between a length H of the sloping surface in a direction of the rotation axis from an end on an inlet side to an end on the outlet side and a fan diameter D of the propeller fan, and a relationship of 0 < θ ≤ 60° for an angle θ formed between a line connecting the ends of the sloping surface and the rotation axis.