A polymer obtained by polymerizing a compound represented by formula (I) in a presence of a polymerization accelerator; a film-forming composition comprising the polymer; an insulating film formed by utilizing the composition; and an electronic device, ##STR00001## in formula (I), R.sup.1 and R.sup.2 each independently represents a substituent containing a carbon-carbon triple bond; X.sup.1 and X.sup.2 each independently represents a substituent except for a substituent containing a carbon-carbon triple bond; l and m each independently represents an integer of 0 to 15, provided that l and m are not 0 at the same time; and p and n each independently represents an integer of 0 to 14.