An illuminance change detector obtains detected illuminance values from a plurality of illuminance detectors, and determines whether the illuminance value detected by each illuminance detector changed from an illuminance range to another illuminance range. Each of the memory cells has a tunnel insulating film formed on the silicon substrate, a charge film formed on the tunnel insulating film, and a common block film formed on the charge film. The crystal of a non-solvate of -1-butyl-2,5-dioxo-3–1-hydroxy-1-cyclohexylmethyl-9-4-phenylmethyl-1,4,9-triazaspiro5. The adhesive bond is designed to withstand the stresses caused by the hydroforming operation and to retain its strength so that the hydroformed article is then usable as a vehicular frame element.