A positive-type photosensitive resin composition, including: (a) a novolac resin; (b) a polymer including, as a main component, a structure represented by formula (1) and/or formula (2):  (wherein R1 and R2 may be the same or different and each represent an organic group having at least two carbon atoms and a valence of 2 to 8, R3 and R4 may be the same or different and each represent hydrogen or a monovalent organic group of 1 to 20 carbon atoms, —NH—R5 in formula (1) and —CO—R6 in formula (2) each represent a polymer end group, R5 and R6 each represent a monovalent organic group having 2 to 30 carbon atoms which includes an unsaturated hydrocarbon group, n is in the range of 10 to 100,000, l and m each represent an integer of 0 to 2, and p and q each represent an integer of 0 to 4, provided that p+q>0; (c) a quinone diazide compound; (d) an alkoxymethyl group-containing compound; and (e) a solvent.