The present invention provides: a novel organic titanium compound having an effect as an adhesion promoter by itself; a production method of such organic titanium compound; and a room temperature-curable resin composition containing such organic titanium compound both as a curing catalyst and as an adhesion promoter. Provided are an organic titanium compound represented by an average composition formula (I): Ti(OR1)4-a(Y3Si-A-O—CO—CH═C(O)R)a (wherein R1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, R represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, A represents a divalent hydrocarbon group having 3 to 6 carbon atoms, Y represents a hydrolyzable group, and a represents a number satisfying 0