To offer a sliding structure of a slide unit, which permits a unit body to make smooth sliding motions in reciprocations and can offer a fine appearance through widening of the degree of freedom in terms of designing the unit body.

A sliding structure of a slide unit is configured so that the unit body 21 of the slide unit 20 can be accommodated and drawn out in/from the accommodation part 11 of a member to be mounted 10 through an opening 10a provided in it with the aid of a guide rail 12 and rollers 26 and 27, wherein the guide rail 12 is located in the accommodation part 11 of the member to be mounted 10, and a dolly part 25 fitted with the roller 26 running in such a way as pinching the rail 12 is furnished at the tail 24 of the unit body 21. Two rollers 26 in pair are installed on at least one diagonal of the dolly part 25, thereby holding the guide rail 12 pinchedly.