To obtain a hinge which can sufficiently bear the weight of a paper sliding door and facilitates the opening operation of the paper sliding door.

There are provided a window frame side mounting plate 1 which is mounted to the top or bottom frame of a window frame and has therein a forwardly opened guide groove 2 oriented in a left-to-right direction, a slide arm 3 whose rear end is slidably fitted in the groove 2, a paper sliding door side mounting plate 4 which is supported swingably, back and forth, with respect to the arm 3 and which is mounted along the top rail or bottom rail of a paper sliding door frame, and a connection arm 5 which is longer than the arm 3 and whose opposite ends are rotatably connected to the plate 4 and the plate 1 respectively. And a vertical pivoting part 13 is provided in the groove 2 so as to be located outside the arm 3 and a receiving part 14, which fits on the part 13 in a horizontal direction, is formed at the rear end of the arm 3.