A current detecting device comprising: a busbar through which an electric current flows; a magneto-electric converting element that outputs a signal in response to a magnetic field generated by the electric current flowing through the busbar; a housing that is made of nonmagnetic material, and accommodates the busbar and the magneto-electric converting element therein; and a shield plate for magnetic shielding that is attached to the housing so as to surround the magneto-electric converting element and a part of the busbar which is opposed to the magneto-electric converting element, wherein the shield plate includes a pair of side plates and a connecting plate which connects base ends of the pair of side plates to each other, and is formed in a U-shape in cross section in which an opening is formed between leading ends of the pair of side plates; wherein the housing includes an inner frame portion which accommodates the busbar and the magneto-electric converting element and an outer frame portion which covers the outside of the shield plate, and the shield plate is arranged at the outside of the inner frame portion; characterized in that the outer frame portion is formed in a tubular shape having a first opening portion and a second opening portion which are arranged at both end sides in an extending direction of the pair of side plates; and wherein the leading ends of the pair of side plates of the shield plate are located more inside than an opening peripheral edge of the first opening portion of the outer frame portion so that a predetermined distance (d) is secured between the leading ends of the pair of side plates of the shield plate and the opening peripheral edge of the first opening portion of the outer frame portion. a busbar through which an electric current flows; a magneto-electric converting element that outputs a signal in response to a magnetic field generated by the electric current flowing through the busbar; a housing that is made of nonmagnetic material, and accommodates the busbar and the magneto-electric converting element therein; and a shield plate for magnetic shielding that is attached to the housing so as to surround the magneto-electric converting element and a part of the busbar which is opposed to the magneto-electric converting element, wherein the shield plate includes a pair of side plates and a connecting plate which connects base ends of the pair of side plates to each other, and is formed in a U-shape in cross section in which an opening is formed between leading ends of the pair of side plates; wherein the housing includes an inner frame portion which accommodates the busbar and the magneto-electric converting element and an outer frame portion which covers the outside of the shield plate, and the shield plate is arranged at the outside of the inner frame portion; characterized in that the outer frame portion is formed in a tubular shape having a first opening portion and a second opening portion which are arranged at both end sides in an extending direction of the pair of side plates; and wherein the leading ends of the pair of side plates of the shield plate are located more inside than an opening peripheral edge of the first opening portion of the outer frame portion so that a predetermined distance (d) is secured between the leading ends of the pair of side plates of the shield plate and the opening peripheral edge of the first opening portion of the outer frame portion.