To provide an advantageous method of production for an optically active chrysanthemumic acid.

This method of production for the optically active chrysanthemumic acid reacts an optically active organic amine to the chrysanthemumic acid having a trans isomer ratio ≥70% and optical purity of the trans isomer less than 2-10%e.e. and then carrying out an optical resolution. The optically active organic amine is expressed, for example by general formula (1) or general formula (2). (R1 and R2 are each independently H, an alkyl group or the like, X and Y are each independently H, a halogen atom or the like, * is an asymmetric carbon atom in the formula (1)) and (R1 and R2 have same meaning as the previous description; R3 is an alkyl group; R4 and R5 are each H or the like; and * is an asymmetric carbon atom in the formula (2)).