PURPOSE: To provide an internal releasing agent composition for manufacturing a molding formed of a polyisocyanate and an isocyanate reactive composition, consisting of a releasable organic acid metal salt and a polymer containing two or more guanidine or isourea groups.

CONSTITUTION: This internal releasing agent composition is formed of (A) a releasable organic acid metal salt (preferably, zinc stearate) and (B) a polymer having 2 or more, preferably, 2-4, guanidine or isourea groups of the formula I (A represents O, the formula II; Q1, Q2 represent H, alkyl, or cycloalkyl; Q3, Q4 represent H, alkyl, cycloalkyl, aralkyl, or aryl), for example, a reaction product of polyether polyamide and carbodiimide. This releating agent is suitably used for manufacturing a molding by reacting polyisocyanate with a polymer containing a plurality of isocyanate reactive groups.