Device

A device (100) is provided with a pair of sliders (1a), (1b) positioned on the rear surface of the casing of the device (100) to face each other across a specific distance in the width direction of a support rail so as to sandwich the support rail, the pair of sliders (1a), (1b) being positioned to be able to move in the width direction of the support rail while at least one of the pair of sliders (1a), (1b) is being urged in the direction of sandwiching the support rail. Each of the pair of sliders (1a), (1b) has opposing surfaces (4a), (4b) facing each other, protrusions (2a), (2b) provided on the opposing surfaces (4a), (4b) and protruding from the opposing surfaces (4a), (4b) toward the other of the sliders (1a), (1b), and guide parts (3a), (3b) provided on the opposing surfaces (4a), (4b) between the protrusions (2a), (2b) and side surfaces (1a1), (1b1) on the opposite side to the casing side of the sliders (1a), (1b) to guide the support rail from the side surfaces (1a1), (1b1) to the protrusions (2a),