Résumé dans la langue de publication A paint-charging device for charging a cartridge (25) with paint to allow the paint to breathe during standby. The device comprises a charging valve (61) for feeding/discharging paint fed to the paint storage chamber (30) of the cartridge (25) attached to a charging block (52), and a paint breath valve (91) for feeding/discharging push-out thinner to/from a thinner storage chamber (31). The charging valve (61) is switched to the discharge side to feed the push-out thinner from the paint breath valve (91), thereby pushing out the paint in the paint storage chamber (30). Further, the charging valve (61) is switched to the feed side to discharge the push-out thinner from the paint breath valve (91), thereby feeding the pain to the paint storage chamber (30). This allows the paint in the cartridge (25) to perform a breathing action, preventing separation of the pigment in the paint.