PROBLEM TO BE SOLVED: To provide an electric vehicle battery device which can be assembled and wired easily and improve the productivity. SOLUTION: An electric vehicle battery device has a 1st case 1 in which a plurality of batteries 4 of which the drive power supply 3 of an electric vehicle is composed are housed, power supply cables 6a and 6b which are connected to the output terminals 5a and 5b of the drive power supply 3 and extended out from the 1st case 1 and a 2nd case 2 in which at least contactors 11 with which the power supply cables 6a and 6b and controller connection cables 18a and 18b connected to a vehicle controller are connected to each other and a current sensor 12 which detects a load current are housed.
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