PURPOSE: To attach a paper sliding door efficiently and easily.

CONSTITUTION: A fitted part 12 is provided at the lower face of the upper frame 4 of a frame body fixed at the opening of a building frame and also 8 fitting groove 19 is provided at the upper face of the lower frame 5 respectively. On the other hand, a latch 8 is attached at the upper face of the upper attaching frame 7 of a paper sliding door 3 and a spacer 16 is attached at the lower face of the lower attaching frame 15 respectively. The spacer 16 is fitted to the fitting groove 19. And the upper attaching frame 7 is pushed into the opening to fix the latch 8 into the fitted part 12. In this way, the paper sliding door can be easily assembled.