The invention provides a crystalline polyamide-type resin composition comprises (a) a crystalline polyamide resin composition comprising (i) 50 to 90% by weight of crystalline polyamide resin (A) having a relative viscosity in 96% sulfuric acid of not less than 3.5 and (ii) 50 to 10% by weight of a crystalline polyamide resin (B) having a melting point lower than the melting point of polyamide resin (A) by 20° C. or more and a relative viscosity dissolved in 96% sulfuric acid of not more than 3.6, and (b) 1 to 10 part(s) by weight of a modified polyolefin resin (C) having a reactive functional group being able to react with the terminal group and/or main-chain amide group of the polyamide resin. The invention also provides a door checker for automobiles prepared from the crystalline polyamide-type resin composition.