A battery terminal unit with a current sensor, comprising: a bus bar for a battery terminal, the bus bar including: an attachment part attached to a battery post; an extension part extended from the attachment part; a connection part which continues to the extension part and is configured to connect a wire harness; a receiving portion that receives a board on which a magnetic detection element (Ms) is mounted so that the board is opposed to a surface of the extension part; and a shield plate (Sh), wherein the extension part has a first face and a second face which is opposite to the first face; wherein the magnetic detection element (Ms) and the extension part are covered with the shield plate (Sh); wherein the shield plate (Sh) is arranged so as to be directed to a battery; and wherein the attachment part, the extension part and the connection part are integrally formed; characterized in that the connection part continues to the extension part through an extending portion bent from the extension part so as to be positioned laterally to the extension part, the board is attached to the second face of the extension part, and the shield plate (Sh) has a U shape and is attached to the first face of the extension part so that both end portions of the shield plate (Sh) is inserted into the extension part. a bus bar for a battery terminal, the bus bar including: an attachment part attached to a battery post; an extension part extended from the attachment part; a connection part which continues to the extension part and is configured to connect a wire harness; a receiving portion that receives a board on which a magnetic detection element (Ms) is mounted so that the board is opposed to a surface of the extension part; and a shield plate (Sh), wherein the extension part has a first face and a second face which is opposite to the first face; wherein the magnetic detection element (Ms) and the extension part are covered with the shield plate (Sh); wherein the shield plate (Sh) is arranged so as to be directed to a battery; and wherein the attachment part, the extension part and the connection part are integrally formed; characterized in that the connection part continues to the extension part through an extending portion bent from the extension part so as to be positioned laterally to the extension part, the board is attached to the second face of the extension part, and the shield plate (Sh) has a U shape and is attached to the first face of the extension part so that both end portions of the shield plate (Sh) is inserted into the extension part. an attachment part attached to a battery post; an extension part extended from the attachment part; a connection part which continues to the extension part and is configured to connect a wire harness; a receiving portion that receives a board on which a magnetic detection element (Ms) is mounted so that the board is opposed to a surface of the extension part; and a shield plate (Sh), wherein the extension part has a first face and a second face which is opposite to the first face; wherein the magnetic detection element (Ms) and the extension part are covered with the shield plate (Sh); wherein the shield plate (Sh) is arranged so as to be directed to a battery; and wherein the attachment part, the extension part and the connection part are integrally formed; characterized in that the connection part continues to the extension part through an extending portion bent from the extension part so as to be positioned laterally to the extension part, the board is attached to the second face of the extension part, and the shield plate (Sh) has a U shape and is attached to the first face of the extension part so that both end portions of the shield plate (Sh) is inserted into the extension part.