A fan comprising: an impeller including a boss being a rotation center, and a plurality of blades provided on an outer peripheral surface of the boss; a motor unit (5, 7) configured to drive the impeller to rotate; a housing accommodating the impeller; a plurality of stationary blades disposed downstream of the impeller and connecting the motor unit (5, 7) and the housing; and a connecting portion disposed between the housing and a rotation axis of the impeller, and extending in a rotation direction of the impeller to connect the plurality of stationary blades (8, 9), wherein the plurality of stationary blades (8, 9) include a first stationary blade extending from the housing to the motor unit (5, 7); and a second stationary blade disposed at a location shifted from the first stationary blade in the rotation direction and extending from the housing to the connecting portion, and characterised in that the connecting portion has a recessed portion (11,12,13), which is visible in a plan development of a cylindrical cross-section of the fan at a radial position where the connecting portion is disposed, for passing wind that flows in a radial direction of the impeller, and wherein the recessed portion is formed at an upstream side of the connecting portion by an upstream end of the first stationary blade, an upstream end of the connecting portion, and an upstream end of the second stationary blade, and is recessed towards a downstream side from a plane extending through the upstream end of the first stationary blade and the upstream end of the second stationary blade, or wherein the recessed portion is formed at a downstream side of the connecting portion by a downstream end of the first stationary blade, a downstream end of the connecting portion, and a downstream end of the second stationary blade, and is recessed towards an upstream side from a plane extending through the downstream end of the first stationary blade and the downstream end of the second stationary blade. an impeller including a boss being a rotation center, and a plurality of blades provided on an outer peripheral surface of the boss; a motor unit (5, 7) configured to drive the impeller to rotate; a housing accommodating the impeller; a plurality of stationary blades disposed downstream of the impeller and connecting the motor unit (5, 7) and the housing; and a connecting portion disposed between the housing and a rotation axis of the impeller, and extending in a rotation direction of the impeller to connect the plurality of stationary blades (8, 9), wherein the plurality of stationary blades (8, 9) include a first stationary blade extending from the housing to the motor unit (5, 7); and a second stationary blade disposed at a location shifted from the first stationary blade in the rotation direction and extending from the housing to the connecting portion, and characterised in that the connecting portion has a recessed portion (11,12,13), which is visible in a plan development of a cylindrical cross-section of the fan at a radial position where the connecting portion is disposed, for passing wind that flows in a radial direction of the impeller, and wherein the recessed portion is formed at an upstream side of the connecting portion by an upstream end of the first stationary blade, an upstream end of the connecting portion, and an upstream end of the second stationary blade, and is recessed towards a downstream side from a plane extending through the upstream end of the first stationary blade and the upstream end of the second stationary blade, or wherein the recessed portion is formed at a downstream side of the connecting portion by a downstream end of the first stationary blade, a downstream end of the connecting portion, and a downstream end of the second stationary blade, and is recessed towards an upstream side from a plane extending through the downstream end of the first stationary blade and the downstream end of the second stationary blade.