Current sensor

A current sensor comprising:

• a circuit board;
• a shunt resistor-integrated busbar including two busbar portions and a shunt resistor portion connected between the two busbar portions;
• electrical connection portions for electrically connecting conductive traces arranged on the circuit board and the busbar portions;
• and
• a fixing portion for fixing the circuit board to the shunt resistor-integrated busbar,
• wherein where a longitudinal direction of the shunt resistor-integrated busbar is defined as an X axis direction, and a width direction of the shunt resistor-integrated busbar is defined as a Y axis direction,
• the fixing portion includes, on each of the two busbar portions:
• a first portion extending in the Y axis direction;
• and
• a pair of second portions extending toward the shunt resistor portion from both ends, in the Y axis direction, of the first portion, and
• wherein the electrical connection portions are arranged between the second portions constituting the pair inside an area surrounded by the first portion and the second portions constituting the pair.