To provide a resin dispersion providing excellent adhesiveness and low-temperature heat-sealability when used as an adhesive, and capable of sticking a polyolefin-based resin with a metal by low-temperature and short-time heating, to provide a laminate having excellent light shielding properties, gas-barrier properties or the like, further having suitability for protecting contents, and useful for packing and packaging mainly a retort food, snack cakes, oils and fats, a medicine, miscellaneous goods, an industrial member, etc., and to provide a bag for packaging and a packaging container obtained by forming the laminate.

The resin dispersion is obtained by dispersing, in an aqueous medium, a polymer (D) obtained by bonding an unsaturated carboxylic acid (B) to a polyolefin (A) having a weight average molecular weight Mw of ≥10,000 and ≤100,000 so that the acid-modification rate may be >1.3% and <10%, further bonding a hydrophilic polymer (C) in a proportion of (A):(C) of from 100:1 to 100:100 thereto.