Abstract: The problem of the present invention resides in providing a projector having a telescopic post which is easy to deal with a multiple stage structure, capable of setting illumination devices at high positions, sufficiently considering also of safety and excellent in operability. The resolving means is as follows. There is provided a telescopic post in which a plurality of middle pipe posts having successively reduced inner diameters are ascendably and descendably inserted into a base pipe post fixed to a carriage and the respective middle pipe posts are ascended and extended by elastic force of built-in gas dampers. The gas dampers are of a gas damper structure of a tandem type connected in a vertical direction in the telescopic post.