Abstract: An inexpensive laminated safety glass excelling in resistance to penetration as well as in its low temperature properties, which is hardly discolored with the passage of time, which comprises a laminated assembly of at least two sheets of glass between which is interposed a layer of a polyurethane elastomer, said sheets and said layer being firmly bonded together, said layer of polyurethane elastomer being obtained by curing, in the presence of curing agent, a polyurethane prepolymer having --NCO group at its both ends produced by reacting a diisocyanate with a polyester having --OH group at its both ends which has been obtained by reacting the dicarboxylic acids and their acid anhydrides with at least one kind of glycol, and the process for producing the same.