A liquid cargo ship having a cargo pump apparatus, said liquid cargo ship comprising a plurality of holds partitioned by a central bulkhead provided upright along a center line of the cargo ship and a plurality of transverse bulkheads provided upright at right angles to the central bulkhead, the central bulkhead standing upright on a lower longitudinal stool provided on an inner bottom plate of a double bottom, the lower longitudinal stool being almost isosceles-trapezoidal in cross section; said liquid cargo ship further comprising a cargo pump room being provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, the cargo pump room connecting, along the central bulkhead, a hatch provided in an upper deck and the inside of the lower longitudinal stool; the cargo pump room being provided with a deep well pump and a residual collection apparatus; a suction side of the deep well pump being connected through a hydraulic valve to a cargo suction portion (51 - 56) penetrating an inclined wall of the lower longitudinal stool, the cargo suction portion (51 - 56) having an open end placed in a suction well recessed in the inner bottom plate of the hold; a discharge side of the deep well pump being connected to a cargo discharge pipe passing through the cargo pump room and connected to a manifold pipe laid on the upper deck; and wherein the deep well pump is disposed in the cargo pump room vertically formed; and the cargo suction portion (51 - 56) connected to the suction side of the deep well pump comprises two or four suction pipes extending to two or four holds adjoining across the central bulkhead, characterized in that the cargo suction portion (51 - 56) in the cargo pump room is connected through an expansion pipe, or the deep well pump is secured through an expansion joint, the deep well pump comprises a pump portion and a motor portion connected through a drive shaft; the hatch comprises a first hatch and a second hatch placed on the first hatch; and the motor portion is secured on the second hatch. the central bulkhead standing upright on a lower longitudinal stool provided on an inner bottom plate of a double bottom, the lower longitudinal stool being almost isosceles-trapezoidal in cross section; said liquid cargo ship further comprising a cargo pump room being provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, the cargo pump room connecting, along the central bulkhead, a hatch provided in an upper deck and the inside of the lower longitudinal stool; the cargo pump room being provided with a deep well pump and a residual collection apparatus; a suction side of the deep well pump being connected through a hydraulic valve to a cargo suction portion (51 - 56) penetrating an inclined wall of the lower longitudinal stool, the cargo suction portion (51 - 56) having an open end placed in a suction well recessed in the inner bottom plate of the hold; a discharge side of the deep well pump being connected to a cargo discharge pipe passing through the cargo pump room and connected to a manifold pipe laid on the upper deck; and wherein the deep well pump is disposed in the cargo pump room vertically formed; and the cargo suction portion (51 - 56) connected to the suction side of the deep well pump comprises two or four suction pipes extending to two or four holds adjoining across the central bulkhead, characterized in that the cargo suction portion (51 - 56) in the cargo pump room is connected through an expansion pipe, or the deep well pump is secured through an expansion joint, the deep well pump comprises a pump portion and a motor portion connected through a drive shaft; the hatch comprises a first hatch and a second hatch placed on the first hatch; and the motor portion is secured on the second hatch.