A current measurement device for measuring current flowing in a composite material containing conductive fibers, the current measurement device comprising: a temperature measuring unit that is adapted to measure the temperature of a surface of the composite material, upon flow of current in the composite material; a storage unit that is adapted to store conversion data that is acquired through a preliminary test carried out beforehand and that results from converting the temperature of the composite material surface to a value of current flowing in the fibers of the composite material; and a current calculator that, on the basis of the conversion data stored in the storage unit, is adapted to convert the temperature of the composite material surface, as measured by the temperature measuring unit, to a value of current flowing in the fibers of the composite material, characterised in that the composite material is a laminate resulting from layering a plurality of fiber layers including fiber layers having mutually dissimilar fiber directions, the laminate being penetrated by fasteners of fastening pieces; wherein the conversion data is acquired in each fiber direction, in the preliminary test, through measurement of temperature and current values in respective fiber directions centered on a current-applying electrode at the time of application of current to a specimen of a material identical to the composite material; wherein the temperature measuring unit is adapted to measure the temperature of the composite material surface in respective fiber directions centered on the fasteners; and wherein the current calculator is adapted to convert the temperature of the composite material surface in each fiber direction, as measured by the temperature measuring unit, to a current value by using the conversion data in the corresponding fiber direction. a temperature measuring unit that is adapted to measure the temperature of a surface of the composite material, upon flow of current in the composite material; a storage unit that is adapted to store conversion data that is acquired through a preliminary test carried out beforehand and that results from converting the temperature of the composite material surface to a value of current flowing in the fibers of the composite material; and a current calculator that, on the basis of the conversion data stored in the storage unit, is adapted to convert the temperature of the composite material surface, as measured by the temperature measuring unit, to a value of current flowing in the fibers of the composite material, characterised in that the composite material is a laminate resulting from layering a plurality of fiber layers including fiber layers having mutually dissimilar fiber directions, the laminate being penetrated by fasteners of fastening pieces; wherein the conversion data is acquired in each fiber direction, in the preliminary test, through measurement of temperature and current values in respective fiber directions centered on a current-applying electrode at the time of application of current to a specimen of a material identical to the composite material; wherein the temperature measuring unit is adapted to measure the temperature of the composite material surface in respective fiber directions centered on the fasteners; and wherein the current calculator is adapted to convert the temperature of the composite material surface in each fiber direction, as measured by the temperature measuring unit, to a current value by using the conversion data in the corresponding fiber direction.