The present invention pertains to the provision of a green light-emitting pigment having excellent light resistance. A benzothioxanthene compound according to an embodiment of the present invention has a structure represented by formula 1 below, and has an excitation wavelength of 475-510 nm and a light emission wavelength of 510-545 nm. (In formula 1, each R1 is independently an H, an alkyl group, or an ether group, R2 is a saturated hydrocarbon that may have a substituent or is an aromatic hydrocarbon that may have a substituent, and each X is independently an H, a sulfonic acid group, or a sulfonic acid base.)