To provide a pressure-sensitive adhesive composition for a surface protecting sheet which can produce the surface protecting sheet having high-speed peeling power lower than low-speed peeling power and excellent wettability.

A component (A) including 3-40 wt.% of a (meth)acrylic acid alkylene oxide adduct and a component (B) including 60-97 wt.% of a polymerizable monomer except the (meth)acrylic acid alkylene oxide adduct are subjected to drop-wise polymerization where the component (A) and the component (B) begin to drop separately and simultaneously and the component (A) ends to drop with dropping time of 1/4 to 2/4 of that of the component (B) to obtain a (meth)acrylic copolymer having theoretical glass transition temperature of -50°C to 0°C. The (meth)acrylic copolymer is compounded with a crosslinking agent and is crosslinked to obtain the pressure-sensitive adhesive composition.