Abstract: A hot melt adhesive which comprises a copolyamide consisting essentialy of (1) .epsilon.-caprolactam, (2)(a) hexamethylenediamine and (b) at least one straight chain, saturated aliphatic dicarboxylic acid having 6 to 20 carbon atoms in a substantially equimolar ratio and (3)(a) at least one of 2,2,4-trimethylhexamethylenediamine and 2,4,4-trimethylhexamethylenediamine and (b) at least one straight chain, saturated aliphatic dicarboxylic acid having 6 to 20 carbon atoms in a substantially equimolar ratio, the proportion of [A] the constituent unit essentially consisting of the component (1), [B] the contituent unit essentially consisting of the components (2)(a) and (2)(b) and [C] the constituent unit essentially consisting of the components (3)(a) and (3)(b) therein being within a pentagon circumscribed by the lines connecting the points P (82/17/1), Q (52/47/1), R (0/65/35), S (0/50/50) and T (86/7/7) in the graph as shown in FIG.