Disclosed are a diamine represented by the following formula, a polyimide and a polyamide using the same as the raw material, a cyclized product thereof, and a method for producing the same. In the formula, A represents a single bond, an ether bond, a sulfide bond, CO, CH2, SO, SO2, C(CH3)2, NHCO or C(CF3)2, or a bivalent group having an aliphatic ring, a hetero ring or an aromatic ring, R1 represents a C1-4alkyl group or a halogen group, and each of “a” and “b” independently represents an integer of 0-2, and 1≦a+b≦4. The polyimide and the polyamide are a fluorescent polyimide and a fluorescent polyamide that are easily soluble in organic solvents to the extent that they can be formed into a film by a wet process when making an optical device, that have heat resistance and strength when formed into a film, and that have superior fluorescent characteristics.