To provide a device for forming an opening for warp yarns, capable of reducing the consumption of an electric power, and further realizing an ideal ratio of a driving power to a prescribed space, and a loom having the same device.

This device for forming an opening for warp yarn has a held frame collected together into one group, a linear driving unit 102 and a joining means 103. Plural linear driving units 102 constituting each of the groups are arranged along a line crossing obliquely in the longitudinal direction of the held frame and also form a driving device. The joining means 103 is formed in order to realize the oblique arrangement of the linear driving units 102 in a group.