Electric current sensor

The invention provides a current sensor device capable of avoiding error action of current detection caused by an external magnetic field and cutting cost. The current sensor device is magnetic core-free and is provided with a magnetic detection element detecting magnetic flux generated in a current path; and a magnetic shielding part arranged around the magnetic detecting element and shielding magnetic flux for the magnetic detection element and from the external. The magnetic shielding part is provided with a first magnetic shielding part made of a first magnetic shielding material having a first relative magnetic conducting rate and a second magnetic part made of the a second magnetic shielding material having a second magnetic conducting rate different from the first magnetic conducting rate. 本发明提供电流传感器装置，其既能够避免由外部磁场引起的电流检测的误动作又能够削减成本。该电流传感器装置是无磁芯型的，其具备：磁检测元件，其检知电流路径所产生的磁通；以及磁屏蔽部，其设置在磁检测元件的周围，屏蔽对于磁检测元件的、来自外部的磁通，磁屏蔽部具备由具有第1相对磁导率的第1磁屏蔽材料构成的第1磁屏蔽部和由具有与第1相对磁导率不同的第2相对磁导率的第2磁屏蔽材料构成的第2磁屏蔽部。