Tank for heat exchanger, and method for manufacturing same

)A tank (1) has a substantially rectangular-shaped opening extending in the longitudinal and transverse directions and is provided with a tank wall (4), the cross-section of which perpendicular to the longitudinal direction of the opening is curved. A tank leg section (5) is extended along the entire periphery of the opening of the tank wall (4). A gate position (GP) is provided at the center, in the longitudinal direction, of one side surface (5a) of the tank leg section (5), the one side surface (5a) extending in the longitudinal direction of the tank wall (4). In this configuration, the flow of a resin in the direction along the curved cross-section of the tank wall (4) occurs at the center of the tank (1) in the longitudinal direction. That is, the flow is oriented in the strengthening direction in which the orientation of glass fibers is aligned with the direction of deformation of the tank (1) caused by inner pressure load. As a result of this configuration, the strength and rigidity of the tank (1) are