Abstract: Provided is a relay box housing obtained by molding a resin composition containing (a) a polypropylene resin, (b) a polyphenylene ether resin, and (c) a hydrogenated block copolymer. The resin composition has a deflection temperature under load of 100° C. or higher and a ratio of the storage elastic modulus G?A to G?B, expressed as G?A/G?B, of 0.9 to 1.5. Multipurpose test specimens A and B are obtained from the resin composition with an injection molding method with a first multipurpose test specimen A immersed in water under predetermined conditions and a second multipurpose test specimen B not immersed. Storage elastic modulus measurement is performed on each of the test specimens A and B at 50° C. in a tensile mode to obtain the storage elastic moduli G?A and G?B.