A novel polycyanoaryl ether exhibiting excellent heat-resistance, hydrolysis-resistance and weatherability, as well as industrially high general-purpose properties, and the method for the production thereof is to be provided. The polycyanoaryl ether of this invention is represented by the formula (1): wherein R1 stands for a substituted or unsubstituted alkyl group of 1 to 12 carbon atoms, a substituted or unsubstituted alkoxy group of 1 to 12 carbon atoms, a substituted or unsubstituted alkylamino group of 1 to 12 carbon atoms, a substituted or unsubstituted alkylthio group of 1 to 12 carbon atoms, a substituted or unsubstituted aryl group of 6 to 20 carbon atoms, a substituted or unsubstituted aryloxy group of 6 to 20 carbon atoms, a substituted or unsubstituted arylamino group of 6 to 20 carbon atoms, or a substituted or unsubstituted arylthio group of 6 to 20 carbon atoms; R2 stands for a divalent organic group; and n stands for a degree of polymerization.