To obtain the new subject composition useful for molding resin, etc., capable of polymerizing or curing a basic curable compound or a radically polymerizable compound in a short time by energy ray or heat.

The objective base generating compound is expressed by formula [L is at least one kind of ligand selected from ammonium, pyridine, imidazole, ethylenediamine, trimethylenediamine, etc.; n is the coordination number of L of 2-6; Ar is a (substituted) 6-18C monocyclic, condensed polycyclic aryl; R is a (substituted) 6-18C linear, a branched chain, a cyclic alkyl], for example hexa-amminecobalt (III)tris(triphenylbutylborate), etc. The object generating agent is obtained, for example, by mixing halogen salt of a complex ion, etc., and borate salt of an alkali metal in solvent such as water, alcohol, etc.