A shift lock apparatus has a shift lever operated selectively in a first and second directions to switch a gear of a vehicle. The male joint of the first piping member is inserted into the female joint of the second piping member in one touch by using deformation of the engagement portions, and a detent portion is provided at an engagement position where the engagement portions engage with the first piping member to prevent a rotation. The refractive index of the film varies according to heat excitation, and the film comprises crystal grains of an oxide and amorphous portions present between the crystal grains. Once the desired adjustment is selected, the legs are locked. The reference can be used to easily measure camber, offset, toe-in and toe-out of the other wheels, as well as car body and frame dimensions. A projection video display device comprises an optical engine which projects light which is emitted from a light source upon a liquid-crystal panel and forms a video, and a projection optical assembly which projects an enlargement of the video which is emitted from the optical engine.