To obtain a polyamide resin composition that has extremely excellent impact resistance and durability, low water absorption properties and excellent properties such as heat resistance, sliding properties, chemical resistance, etc.

The polyamide resin composition comprises a polyamide (I) having a dicarboxylic acid unit (a) containing 50-100 mol% of a terephthalic acid unit and a diamine unit (b) containing 50-100 mol% of a 1,9-nonanediamine unit and/or a 2-methyl-1,8-octanediamine unit and an olefin-based polymer (II) having at least one kind of a functional group selected from the group consisting of a carboxy group, an acid anhydride group and an epoxy group and ≤50 MPa tensile modulus at 23°C in the weight ratio of the polyamide (I) to the olefin-based polymer (II) by weight of 99.5:0.5-50:50.