To easily retain an upper door in the opened state.

The fire hydrant apparatus has a hose storage part inside a housing in which a fire hose is stored in the involute state; and a maintenance door, a lower door and a front inclined door are disposed in a front opening of the hose storage part. The maintenance door is opened upward. A shaft hole into which a rotating shaft of the maintenance door is inserted is a long slot, and the rotation shaft is slid and forced into the slot. In addition, a hitting plate is disposed to retain the maintenance door in the opened state. In this way, the structure is simple and the operation to retain the door in the opened state is easy at the same time.