An isothiocyanate-containing composition is provided in which bleeding of the composition is suppressed and even if an isothiocyanate volatilizes, the adhesion strength is retained. An isothiocyanate-containing composition is provided wherein an isothiocyanate is mixed into a mixture of a rubber adhesive having a softening point of less than 100° C. and a hydrogenated terpene resin having a softening point of less than 100° C. by an amount of 0.5-15 wt % of an isothiocyanate relative to the total amount of the mixture. The composition has a viscosity at 90° C. of 3000-40000 mPa.s and an adhesion strength of 1 N/25 mm or over when used as an adhesive to laminate two films, irrespective of whether or not the isothiocyanate has volatilized.