To provide a resin composition having large light transmittance and capable of providing a molded article which is highly laser-weldable to an absorbing resin member, as well as a kit, a method for manufacturing the resin composition, a method for manufacturing a formed article, and a formed article. The resin composition contains a polyamide resin, a maleic anhydride-modified polyphenylene ether-based resin, a phosphazene-based flame retardant, a zinc metal oxide, and a light transmitting dye.