A current sensing device and a manufacturing method of the same are disclosed. The current sensing device includes: a core having a gap; and a magnetic sensor inserted in the gap. The core includes a first core member and a second core member each made of a grain-oriented magnetic steel sheet having a magnetization easy axis. The first and second core members are stacked into a multiple layer structure so that a direction of the magnetization easy axis of the first core member and that of the second core member are perpendicular to each other. The first core member has a first trap part. The second core member has a second trap part.