An emulsion type adhesive composition comprising a mixture of at least two kinds of emulsions, the emulsion type adhesive composition comprising: 51 to 90% by mass of a low-Tg acrylic adhesive emulsion as a main component; and 10 to 49% by mass of a high-Tg copolymer emulsion as an accessory component, and having: a solid content of 50% or more; and a viscosity of 1000 mPa·s or lower at 25°C, wherein: the low-Tg acrylic adhesive emulsion has a glass transition temperature (Tg) of -70°C to -50°C; the high-Tg copolymer emulsion is an emulsion of a copolymer obtained by subjecting a monomer mixture comprising at least an alkyl (meth)acrylate-based monomer to emulsion polymerization in the presence of 20 to 200 parts by mass of a tackifying resin relative to 100 parts by mass of the monomer mixture, the copolymer having a glass transition temperature (Tg) of -30°C to 30°C, a weight average molecular weight of 5000 to 70000 and an average particle diameter of 200 to 2000 nm. wherein the viscosity, the Tg, the weight average molecular weight and the average particle diameter are measured by the methods disclosed in the description. 51 to 90% by mass of a low-Tg acrylic adhesive emulsion as a main component; and 10 to 49% by mass of a high-Tg copolymer emulsion as an accessory component, and having: a solid content of 50% or more; and a viscosity of 1000 mPa·s or lower at 25°C, wherein: the low-Tg acrylic adhesive emulsion has a glass transition temperature (Tg) of -70°C to -50°C; the high-Tg copolymer emulsion is an emulsion of a copolymer obtained by subjecting a monomer mixture comprising at least an alkyl (meth)acrylate-based monomer to emulsion polymerization in the presence of 20 to 200 parts by mass of a tackifying resin relative to 100 parts by mass of the monomer mixture, the copolymer having a glass transition temperature (Tg) of -30°C to 30°C, a weight average molecular weight of 5000 to 70000 and an average particle diameter of 200 to 2000 nm. a solid content of 50% or more; and a viscosity of 1000 mPa·s or lower at 25°C, wherein: the low-Tg acrylic adhesive emulsion has a glass transition temperature (Tg) of -70°C to -50°C; the high-Tg copolymer emulsion is an emulsion of a copolymer obtained by subjecting a monomer mixture comprising at least an alkyl (meth)acrylate-based monomer to emulsion polymerization in the presence of 20 to 200 parts by mass of a tackifying resin relative to 100 parts by mass of the monomer mixture, the copolymer having a glass transition temperature (Tg) of -30°C to 30°C, a weight average molecular weight of 5000 to 70000 and an average particle diameter of 200 to 2000 nm. the low-Tg acrylic adhesive emulsion has a glass transition temperature (Tg) of -70°C to -50°C; the high-Tg copolymer emulsion is an emulsion of a copolymer obtained by subjecting a monomer mixture comprising at least an alkyl (meth)acrylate-based monomer to emulsion polymerization in the presence of 20 to 200 parts by mass of a tackifying resin relative to 100 parts by mass of the monomer mixture, the copolymer having a glass transition temperature (Tg) of -30°C to 30°C, a weight average molecular weight of 5000 to 70000 and an average particle diameter of 200 to 2000 nm.