The ??-cyanoacrylate-type adhesive composition of this invention as described above contains an ??-cyanoacrylate monomer of the formula (I) ##STR1## wherein R1 represents a straight chain or branched chain alkyl group having 1 to 12 carbon atoms (which may be substituted with a substituent such as a halogen atom or an alkoxy group) a straight chain or branched chain alkenyl group having 2 to 12 ca