A reverse photochromic compound of the related art has difficulty in sensing light with a wavelength of 600 nm or greater in a visible light region which has been used for medical applications. Therefore, an object of the present invention is to provide a reverse photochromic compound and a polymer which have a high sensitivity to light having a wavelength of 600 nm or greater. The present invention relates to a compound and the like represented by the following general formula (1). In the formula, R1 and R4 each independently represent a hydrogen atom or the like, R2, R3, and R5 each independently represent an alkyl group or the like, R6 represents a group having a polymerizable unsaturated group, a carboxy group, or an alkoxycarbonyl group, R31 and R32 each independently represent an alkoxy group or the like, R33 and R34 each independently represent a hydrogen atom or the like, Y1 represents an oxygen atom or a sulfur atom, An− represents an anion, n1 to n3 represent a specific integer, and R1 and R2, R3 and R4, and/or R33 and R34 may form an alkylene group.