A polyamide comprising (a) a unit comprising adipic acid and hexamethylenediamine and (b) a unit comprising isophthalic acid and hexamethylenediamine, wherein a ratio of the isophthalic acid component to the total carboxylic acid component in the polyamide is 0.05≦(x)≦0.5 and a range of blocking ratio (Y) is −0.3≦(Y)≦0.8. Also provided are compositions comprising 30 to 95% by mass of the above polyamide and 5 to 70% by mass of an inorganic filler.