Provided is an outdoor unit which is capable of improving air blowing characteristics without increasing the number of components, by increasing the dimension of a bell mouth in the axial direction. The outdoor unit is provided with: a main body; a top plate (5) which covers the upper surface of the main body, and which is made of sheet metal; an air blower which is provided with a fan motor (22),and which is supported on the top plate (5); and a resin bell mouth (4) which covers the circumference of the air blower in a concentric manner. A motor base part of the fan motor (22) is directly fixed to the top plate (5). The centre of a fan (21) is fixed to a rotational shaft (22a) of the fan motor (22). The whole of the fan (21) is positioned on the upper surface side of the top plate (5). The bell mouth (4) covers the circumference of the whole fan (21) in the axial direction.