A connection device according to an embodiment disclosed herein is a connection device connected to a flexible lighting device and includes a body part, a connection terminal protruding toward the flexible lighting device from the body part and electrically connected to the flexible lighting device, a lighting device guide part provided to protrude toward the flexible lighting device from the body part, configured to guide the flexible lighting device to be inserted into the connection device and having one or more side surfaces provided to be open, and a clip part coupled to an outer side of the lighting device guide part at one open side surface of the lighting device guide part and provided to be fixed to one side surface of the flexible lighting device, which is exposed to the outside due to the one open side surface.