Disclosed is a novel binder which comprises as a main ingredient pullulan and saccharide(s) wherein the weight ratio of said pullulan to saccharide(s) is in the range of 85:15 to 65:35, based on the weight of the dry solid. The binder has a relatively-low viscosity and exerts a satisfiable properties with only a relatively-small amount without a fear of causing an environmental pollution, and because of these it can be advantageously used as a binder in a variety of fields.