Abstract: To provide a polyacetal resin composition and a molded article thereof, which are less likely to crack even if stressed in contact with any hydrochloric acid-containing liquid. The polyacetal resin composition contains, per 100 parts by mass of a polyacetal resin: 0.01 to 10 parts by mass of at least one fatty acid metal salt selected from 1) to 3) below; and 0.1 to 5 parts by mass of a stress relaxant having a melting point of 67.5° C. to 200° C. when measured by using a differential scanning calorimeter at a flow rate of nitrogen of 20 cm3/min and at a heating rate of 10° C./min. 1) metal salt formed of long chain fatty acid having 10 to 34 carbon atoms and calcium; 2) metal salt formed of long chain fatty acid having 10 to 34 carbon atoms and zinc; and, 3) metal salt formed of long chain fatty acid having 10 to 34 carbon atoms and magnesium.

Abstract: 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.

Abstract: To provide a polyamide resin composition that contains a halogen-containing flame retardant, which excels in flame retardance, well suppressed from degrading the transmittance due to darkening, and such molded article. The polyamide resin composition contains a polyamide resin, 1 to 10% by mass of a halogen-containing flame retardant, and 1 to 5% by mass of antimony oxide, the polyamide resin composition having a phosphorus atom concentration of 1.50×10?2% by mass or less.