A welding operation management device, comprising: a weld joint specification input unit that inputs at least an identifier of a weld joint, a welding execution method management number, a joint design, materials of each of two pipes, a pipe diameter, and a pipe thickness as weld joint specifications between the pipes mutually welded in plant construction work; a welding portion thickness identification table that stores a plurality of different combinations of the joint design, the pipe diameter, and the pipe thickness by associating with a respective thickness of a welding portion of the weld joint between the pipes; a welding execution method table that stores a plurality of different combinations of a pair of base metal classes classifying the materials of the pipes by associating with the respective welding execution method management numbers; and a weld joint specification inspection unit that refers to the welding portion thickness identification table using the joint design, the pipe diameter, and the pipe thickness having been input as keys to inspect consistency of a first combination of the joint design, the pipe diameter, and the pipe thickness by detecting that the corresponding data of the first combination exists in the welding portion thickness identification table, and also refers to the welding execution method table using a pair of the base metal classes concerning the respective materials of the pipes having been input as the key to inspect the consistency of a second combination of the materials of the pipes and the welding execution method management number by detecting that the corresponding data of the second combination exists in the welding execution method table. a weld joint specification input unit that inputs at least an identifier of a weld joint, a welding execution method management number, a joint design, materials of each of two pipes, a pipe diameter, and a pipe thickness as weld joint specifications between the pipes mutually welded in plant construction work; a welding portion thickness identification table that stores a plurality of different combinations of the joint design, the pipe diameter, and the pipe thickness by associating with a respective thickness of a welding portion of the weld joint between the pipes; a welding execution method table that stores a plurality of different combinations of a pair of base metal classes classifying the materials of the pipes by associating with the respective welding execution method management numbers; and a weld joint specification inspection unit that refers to the welding portion thickness identification table using the joint design, the pipe diameter, and the pipe thickness having been input as keys to inspect consistency of a first combination of the joint design, the pipe diameter, and the pipe thickness by detecting that the corresponding data of the first combination exists in the welding portion thickness identification table, and also refers to the welding execution method table using a pair of the base metal classes concerning the respective materials of the pipes having been input as the key to inspect the consistency of a second combination of the materials of the pipes and the welding execution method management number by detecting that the corresponding data of the second combination exists in the welding execution method table.