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 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 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 , wherein the plurality of stationary blades include a first stationary blade extending from the housing to the motor unit ; 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 , 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 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 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 , wherein the plurality of stationary blades include a first stationary blade extending from the housing to the motor unit ; 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 , 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 . <EOS>