A pit gate configured to be accommodated in a slot and to seal service water retained in the pit in a watertight manner, the pit gate comprising: a gate main body; a sealing member that is provided on a surface opposite to the slot in the gate main body and that is configured to seal between the gate main body and the slot in a watertight manner; and a pressing clamp that is provided in the gate main body and that is configured to move the gate main body toward the sealing member side due to a weight of the gate main body itself wherein the pressing clamp includes a second gate-side pressing member that is provided so as to protrude from the gate main body along the horizontal direction, and a second slot-side pressing member that is configured to be in contact with the second gate-side pressing member and that is provided in the slot that faces a surface opposite from a surface on which the sealing member of the gate main body is provided, and the second slot-side pressing member is formed in a wedge shape whose thickness becomes greater from the upper side toward the lower side in the vertical direction, so that a second slot-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, and the second gate-side pressing member that is configured to come into contact with the second slot-side inclined surface, so that the second gate-side pressing member moves the gate main body toward the sealing member side, characterized in that the second gate-side pressing member is shaped in a rod-shape. a gate main body; a sealing member that is provided on a surface opposite to the slot in the gate main body and that is configured to seal between the gate main body and the slot in a watertight manner; and a pressing clamp that is provided in the gate main body and that is configured to move the gate main body toward the sealing member side due to a weight of the gate main body itself wherein the pressing clamp includes a second gate-side pressing member that is provided so as to protrude from the gate main body along the horizontal direction, and a second slot-side pressing member that is configured to be in contact with the second gate-side pressing member and that is provided in the slot that faces a surface opposite from a surface on which the sealing member of the gate main body is provided, and a second gate-side pressing member that is provided so as to protrude from the gate main body along the horizontal direction, and a second slot-side pressing member that is configured to be in contact with the second gate-side pressing member and that is provided in the slot that faces a surface opposite from a surface on which the sealing member of the gate main body is provided, and the second slot-side pressing member is formed in a wedge shape whose thickness becomes greater from the upper side toward the lower side in the vertical direction, so that a second slot-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, and the second gate-side pressing member that is configured to come into contact with the second slot-side inclined surface, so that the second gate-side pressing member moves the gate main body toward the sealing member side, characterized in that the second gate-side pressing member is shaped in a rod-shape.