To easily perform hose winding operation and inspection work by removing a fire hydrant door with the fire hydrant doors as being removable/attachable without needing to remove/attach a buffer device.

A fire hydrant device is provided with buffer devices 65 which are displaced on a case body 12-1 side separated from a fire hydrant door 18 and suppresses a movement of the door by contacting it in an open state at prescribed angle or larger of the fire hydrant door 18. The buffer devices 65 are provided at two places near an axis below on both sides of the fire hydrant door 18. The fire hydrant door 18 is also extended below beyond the axis of an abutting part 68 in contact with the buffer devices 65. The fire hydrant door 18 is freely removably/attachably installed to a door opening part of the case body 12-1 by a door removal/attachment structure.