To provide an arranging device of a dressed plate and a wiring accessory changing the setting direction thereof to a desired direction and easily coping with a change of this setting direction.

The bottom wall 24 of a mounting frame 23 of the wiring accessory is formed with a pair of first holding holes 27 and a pair of second holding holes 28. The second holding hole 28 is formed almost in a plain cross shape allowing the front surface side extending lengthwise or sidewise of the wiring accessory to pass through. The second holding hole 28 can hold the wiring accessory with its setting direction rotated at 90 degrees. A plate body 34 is formed with a pair of first passing holes 35 and a pair of second passing holes 36 of square shapes. Corresponding to the second passing hole 36, a frame 39 formed in a plane square shape and formed with a through hole 40 can be mounted on the plate body 34 with the direction of this through hole 40 corresponding to the setting direction of the front surface side of the wiring accessory.