Provided is a sealant composition having excellent adhesion of a coating material to a surface of the sealant composition and excellent workability at the time of sealing treatment. The sealant composition contains (A) a reactive polymer, (B) spherical particles having a particle diameter of0.015 to 2 mm, and (C) a curing catalyst, wherein the sealant composition contains 0.05 to 15 % by volume, based on the sealant composition, of the particles (B).