A cable assembly, comprising: a body block including a power supply control circuit (ZCT, 10, 11, 12) interposed between a charge circuit of a vehicle and a power source and turning on/off power supply from the power source to the charge circuit, and a housing accommodating the power supply control circuit (ZCT, 10, 11, 12); a power side cable having a plurality of wires (PC1, PC2, PC3) through which the power source and the power supply control circuit (ZCT, 10, 11, 12) are electrically connected to each other; and a vehicle side cable having a plurality of wires (CC1, CC2, CC3, CC4) through which the charge circuit and the power supply control circuit (ZCT, 10, 11, 12) are electrically connected to each other, wherein at least one of the power side cable and the vehicle side cable includes: a plurality of contacts made of conductive material and electrically connected to the respective wires thereof (PC1~PC3 or CC1~CC4); and a holder holding the contacts, wherein the body block has a plurality of terminals made of conductive material, the terminals being electrically connected to the power supply control circuit (ZCT, 10, 11, 12) and held by the housing such that a portion of each of the terminals is exposed out of the housing, wherein the housing is provided with at least one joint part to which the holder is detachably coupled, wherein the contacts are brought into contact with the respective terminals in the state where the holder is coupled to the joint part, so that the respective wires (PC1~PC3 or CC1~CC4) are electrically connected to the power supply control circuit (ZCT, 10, 11, 12), characterized in that a covering unit with a substantially annular shape as a whole is coupled to the housing and includes two half-segmented bodies (5a, 5b), wherein each of the half-segmented bodies (5a or 5b) includes a semi-annular part (51 a or 51 b) and two joints (52a or 52b), the two joints protruding outwardly from both circumferential ends of the semi-annular part (51a or 51b) in a radial direction, and wherein the two half-segmented bodies (5a, 5b) are coupled to each other while the semi-annular parts (51a, 51b) surround the holder attached to the joint part so that the covering unit covers at least a coupling portion between the holder and the joint part to inhibit the holder from being detached from the housing in the state where the covering unit is coupled to the housing. a body block including a power supply control circuit (ZCT, 10, 11, 12) interposed between a charge circuit of a vehicle and a power source and turning on/off power supply from the power source to the charge circuit, and a housing accommodating the power supply control circuit (ZCT, 10, 11, 12); a power side cable having a plurality of wires (PC1, PC2, PC3) through which the power source and the power supply control circuit (ZCT, 10, 11, 12) are electrically connected to each other; and a vehicle side cable having a plurality of wires (CC1, CC2, CC3, CC4) through which the charge circuit and the power supply control circuit (ZCT, 10, 11, 12) are electrically connected to each other, wherein at least one of the power side cable and the vehicle side cable includes: a plurality of contacts made of conductive material and electrically connected to the respective wires thereof (PC1~PC3 or CC1~CC4); and a holder holding the contacts, wherein the body block has a plurality of terminals made of conductive material, the terminals being electrically connected to the power supply control circuit (ZCT, 10, 11, 12) and held by the housing such that a portion of each of the terminals is exposed out of the housing, wherein the housing is provided with at least one joint part to which the holder is detachably coupled, wherein the contacts are brought into contact with the respective terminals in the state where the holder is coupled to the joint part, so that the respective wires (PC1~PC3 or CC1~CC4) are electrically connected to the power supply control circuit (ZCT, 10, 11, 12), characterized in that a covering unit with a substantially annular shape as a whole is coupled to the housing and includes two half-segmented bodies (5a, 5b), wherein each of the half-segmented bodies (5a or 5b) includes a semi-annular part (51 a or 51 b) and two joints (52a or 52b), the two joints protruding outwardly from both circumferential ends of the semi-annular part (51a or 51b) in a radial direction, and wherein the two half-segmented bodies (5a, 5b) are coupled to each other while the semi-annular parts (51a, 51b) surround the holder attached to the joint part so that the covering unit covers at least a coupling portion between the holder and the joint part to inhibit the holder from being detached from the housing in the state where the covering unit is coupled to the housing.