PURPOSE: To provide a quick-curing adhesive compsn. having excellent storage stability and high bonding speed, by blending an SO3 complex of a tertiary amine and/or a sulfonium tetrafluoroborate with a 2-cyanoacrylate.

CONSTITUTION: 0.1W5,000ppm of an SO3 complex of a tertiary amine (B) of formulaI(wherein R1, R2, R3 are each alkyl, alkenyl, aryl) such as trimethylamine/ SO3 complex or triphenylamine/SO3 complex and/or a sulfonium tetrafluoroborate (C) of formula II such as trimethysulfonium fluoroborate or diphenylsulfonium fluoroborate, are/is blended with a 2-cyanoacrylate (A) such as methyl 2-cyanoacrylate or n-propyl 2-cyanoacrylate to obtain the desired adhesive compsn.