Fan, air conditioning outdoor unit, and air conditioning apparatus

A fan comprising:

• an impeller;
• and
• a casing configured to house the impeller, the casing including
• a first wall portion having a spiral shape extending along an outer peripheral edge of the impeller,
• a suction port at one end in a direction of a rotational axis of the impeller,
• an air passage extending along an inner surface of the first wall portion to be in communication with the suction port and in which an airflow moving from one end toward an other end of the first wall portion is formed, and
• a blow-out port through which air in the air passage is blown out to outside the casing, and
• the other end of the first wall portion being at a position obtained by rotating by 360° or more, with a position of a tongue portion formed at the one end of the first wall portion as a starting point, about the rotational axis in a rotational direction of the impeller.