Propeller fan, outdoor unit, and refrigeration cycle apparatus

A propeller fan comprising:

• a rotation-axis part that serves as a center of rotation of the propeller fan;
• and
• a plurality of blades provided on an outer circumferential side of the rotation-axis part, each blade of the plurality of blades being joined at a leading edge of the blade to a trailing edge of an adjoining blade of the blades,
• the propeller fan having
• a first rib provided on pressure surfaces of the plurality of blades, the first rib projecting downstream in a main airflow direction of the propeller fan that is substantially parallel to an axis of rotation of the propeller fan and surrounding the rotation-axis part, and
• a plurality of second ribs provided on pressure surfaces of the plurality of blades, the plurality of second ribs projecting downstream in the main airflow direction and extending from the rotation-axis part toward the first rib, and
• wherein an axially downstream end of each second rib of the plurality of second ribs is located downstream of an axially downstream end of the first rib in the main airflow direction, and
• wherein the propeller fan further comprises closing ribs that close all of the spaces formed between the first rib and the plurality of second ribs, the closing ribs extending from the axially downstream end of the first rib and being disposed on a plane extending in a direction substantially perpendicular to the main airflow direction.