An LED lighting device of AC power-driven type having a comparatively simple constitution and a high power efficiency. The compounds consist of a carbocyanine dye for visualization, photosensitizer for photodynamic treatment, and tumor receptor-avid peptide for site-specific delivery of the probe and phototoxic agent to diseased tissues. The controller receives the electrical signals transmitted from the detector, and sends commands to instruct the power converter to perform power conversion by operating the switching elements in accordance with switching signals at a different frequency in response to a detection of the system condition. The adjacent first conductive lines are connected to opposite terminals. The second electrical terminal is electrically connected to the output. The first spring portion includes a liner layer includes a brittle material in contact with the second electrode and the first anchor portion, and a base layer formed on the liner layer, includes a brittle material having a composition different from that of the liner layer, and having a film thickness larger than that of the liner layer.