A reinforcing ring includes a ring portion and a cylinder portion is press fitted on a portion which is slightly shifted toward the rear end side from portions on which stators are fixed on parts of a case body. A difference calculating unit compares luminance signals of the current frame acquired by the luminance acquiring unit with those of a previous frame stored in a frame memory, and then takes a difference between these luminance signals. The carbene compounds are of the formula . A lancet carrier is disposed between the base and the cover and includes a anchor fixedly mounted on the base and a lancet support member which is slidably mounted on the base, the anchor and the lancet support member being connected by a spring. The drive or the sensor element is intended for measurement instruments and operates even at very high temperatures.