To smoothly slide up and down a small paper sliding door for a long period and to securely holds a stop position of the small paper sliding door for a long period.

A paper sliding door 1 with glass window behind a sliding bottom half is configured to have small paper sliding doors 2A, 2B, and 2C made vertically movable by forming guide grooves 3L, 3R inside stiles 12, 13 of a paper sliding door body 1A in a vertical direction, and engaging stiles 2L, 2R of the small paper sliding doors 2A, 2B, and 2C with the guide grooves 3L, 3R slidably in the vertical direction. A magnet 6 is arranged at one of the stiles 2L of the small paper sliding door 1 engaging with the guide groove 3L and guide groove 3R, and a metal plate 5 which is opposed to the magnet 6 within a vertical slide range of the small paper sliding door 1 and attracted by the magnet 6 is arranged at the other. and a holding member 7 which fills the gap between the stile 2R engaging with the guide groove 3R and the guide groove 3R, and comes into contact with the guide groove 3R to hold the position of the small paper sliding door 1 in cooperation with the magnet 6 and metal plate 5 is arranged at the stile 2R.