To perform setting work and removing work relative to a mount safely and efficiently.

A first casing 12-1 includes a hose accommodating space 36 and an accommodating space 38 for valves, and a second casing 12-2 includes a fire extinguisher accommodating space 39. A fire hydrant device includes the first casing 12-1 and the second casing 12-2 which are placed on the mount by aligning them from the right to the left when being viewed from the front. Long holes 92, 96 for fixing are provided in two places on right corners on bottom parts of the first and second casings 12-1, 12-2 by arranging them in the front and the back, and four screw holes are provided in the mount to respectively oppose to the long holes 92, 96 for fixing.