In a let-off device (1) for a loom with which warp sheets (5) from one delivery beam (4) are divided into a plurality of parts, independently guided to each of the easing rolls (2) and (3) and a warp opening (9) is formed for each of the warp sheets (5a and 5b), the delivery beam is driven on the basis of tension of only the one warp sheet (5a) so that warp tension has set tension for one warp sheet (5a) and the easing roll (3) corresponding to the other warp sheet (5b) makes only an easing movement by an easing apparatus (14) for other warp sheet (5b). The easing apparatus (14) has corresponding easing rolls and the easing spring (16) exerting applied force to the other warp sheet (5b) by the easing rolls, the easing spring is set at constant tension force of the other warp sheet generated according to one warp sheet and abb interleaving number is different to the other warp sheet and abb interleaving number, which is different to the setting tension force, leading the easing rolls to process easing movement normally.