Disclosed herein is a fluorescent lamp apparatus. The fluorescent lamp apparatus includes a main lamp tube (50) emitting light, a subsidiary lamp tube (90; 92, 94) disposed in communication with the main lamp tube (50), an external electrode (60) provided to the subsidiary lamp tube (90; 92, 94), a connection terminal (70; 72, 74) contacting the external electrode (60) such that electric power is applied to the external electrode (60) through the connection terminal (70; 72, 74), and an insulation cap (80) receiving the connection terminal (70; 72, 74). The fluorescent lamp apparatus includes the external electrode exposed to the outside, so that installation and separation of the fluorescent lamp can be conveniently achieved.