There is provided a display device including an element substrate that has a display area; and a counter substrate. The ultrasonic surgical instrument cuts or shaves hard tissues. Such compounds are useful in the treatment of inflammatory diseases in a mammalian patient, e. The door trim structure is lightweight and simple, and is resistant to side-on collision, and its productivity is high. At least two pegs, each peg having a conical head portion and a shaft portion, are utilized for insertion into the spaced-apart holes on the bottom of the block. Therefore, it is possible to reduce a sidelobe deterioration caused by reflection waves from the radome.