A polyamide elastomer comprising a reaction product of components (a), (b), and (c). Component (a) has the 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 the formula contains multiple repeating units each containing R1, n represents a total number of those repeating units) and the Mn of component (a)=4000-10000. Component (b) has the formula HOOC—；R2—；COOH (where R2 represents a direct bond or a linear saturated hydrocarbon group). Component (c) has the formula H2N—；R4—；(—；O—；R4-)m—；NH2 (where each R4 independently represents a saturated hydrocarbon group containing 1 or more carbon atoms； m represents a real number of 1 or more； and when the formula contains two or more types of the repeating units each containing R4, m represents a total number of the two or more types of the repeating units each containing R4).
