A chromene compound having a skeleton represented by the following formula (1) and exhibiting double peak characteristic:
wherein Z is a group represented by any one of the following formulas:
n is an integer of 1 to 3, when n is 2 or 3, Z's may be the same or different, with the proviso that when n is 1, Z cannot be -CH2-, and when n is 2 or 3, Z's cannot be -CH2- at the same time; R1 is an electron absorbing group having a Hammett constant σp of more than 0, with the proviso that when there are a plurality of R1's, R1's may be the same or different; and X and Y are each independently an oxygen atom or =NR2, with the proviso that X and Y cannot be oxygen atoms at the same time.