Polyamide elastomer comprising reaction product of components (a), (b), (c), (d). Component (a) has formula HOOC—；R1—；(—；NH—；CO—；R1—；)n—；NH2 (where each R1 independently is linear saturated hydrocarbon, n represents a real number of 0 or greater, and when there are multiple repeating units each containing R1, n represents total number of those repeating units). Component (b) has formula HOOC—；R2—；COOH (where R2 represents a direct bond or a linear saturated hydrocarbon group). Component (c) has formula H2N—；R4—；(—；O—；R4—；)m—；NH2 (where each R4 independently represents a saturated hydrocarbon group； m represents a real number of ≥；1； and when there are multiple repeating units each containing R4, m represents total number of those repeating units). Component (d) has formula H2N—；[—；CH(CH3)CH—；O—；]x—；[CH2CH2O—；]y—；[CH2CH(CH3)—；O]z—；CH2CH(CH3)(NH2) wherein (x+z) is a real number of 1 to 6 and y is a real number of 1 to 20. A molar ratio of (c)/(d) in the polyamide elastomer ranges from 9/1 to 1/9.
