To obtain a room temperature-setting resin composition which contains a (meth)acrylic acid ester copolymer as the main component, and can be set to keep the stretchability though it contains substantially no plasticizer, and gives no trouble even in handling for a long time outdoors.

This room temperature-setting resin composition comprises (A) an acrylic copolymer which has a (meth) acrylic acid ester copolymer as the principal chain and has crosslinkable and hydrolysable silyl groups to at the molecular terminals, (B) an aliphatic acid bisamide, (C) a bifunctional aminosilane, and (D) a hardening catalyst, wherein the composition contains substantially no plasticizer and has an elongation rate of 350% or above as determined at a maximum load in a tension test according to JIS A1439.4.3.