Polyamide resin, and polymer film, resin laminate using the same

A polyamide resin in which an average particle size of individual crystals measured by a small-angle X-ray scattering apparatus is 8.0 nm or less, wherein the polyamide resin has a haze value measured for a polyamide resin specimen having a thickness of 45 μm or more and 55 μm or less according to ASTM D1003 of 3.0% or less,

• wherein amorphous polymer chains are present between the individual crystals having the average particle size of 8.0 nm or less,
• wherein a first polyamide segment is included in the individual crystals having the average particle size of 8.0 nm or less,
• wherein a second polyamide segment is included in the amorphous polymer chains present between the individual crystals having the average particle size of 8.0 nm or less, and
• wherein the first polyamide segment and the second polyamide segment form a main chain including an alternating-repeating unit represented by the following Chemical Formula 4:
• in the Chemical Formula 4,
• Ar1 and Ar2 are each independently a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms,
• a1 and a2 are each independently an integer of 1 to 10, and
• b1 and b2 are each independently an integer of 1 to 5.