NOVELTY - The structure (10) has a U-phase bus-bar (20), a V-phase bus-bar (30) and a W-phase bus-bar (40) comprising a U-phase bus-bar main-body part (21), a V-phase bus-bar main-body part (31) and a W-phase bus-bar main-body part (41) extended along a first direction. The V-phase and W-phase bus-bar main-body parts are held in a bus-bar case (50) along a second direction orthogonal to the first direction. The W-phase bus-bar main-body part is held in the case such that U-phase and V-phase bus-bars are straddled at a side of the first direction and a third direction orthogonal to the second direction.    USE - Bus-bar holding structure for an inverter unit of a vehicle e.g. hybrid vehicle such as car (from drawings). Can also be used for a fuel cell electric vehicle and an electric vehicle.    ADVANTAGE - The W-phase bus-bar main-body part is held such that U-phase and V-phase bus-bars are straddled at the side of the first direction and the third direction orthogonal to the second direction, thus ensuring insulation state of each bus-bar while positioning the W- phase bus-bar overlapping with the U-phase and V-phase bus-bars, and hence arranging the bus-bars with sufficient space efficiency. The structure allows magnetic field to be produced in a state from which 120 degrees of phase is deviated from each phase bus-bar, thus weakening interference magnetic field of each phase bus-bar, and hence suppressing electromagnetic noise.    DETAILED DESCRIPTION - The first direction corresponds to a front-back direction of a vehicle, the second direction corresponds to left-right direction of the vehicle and the third direction corresponds to up-down direction of the vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a bus-bar unit of a bus-bar holding structure.    Left direction of vehicle (B)    Up direction of vehicle (H)    Front direction of vehicle (T)    Bus-bar holding structure (10)    U-phase bus-bar (20)    U-phase bus-bar main-body part (21)    V-phase bus-bar (30)    V-phase bus-bar main-body part (31)    W-phase bus-bar (40)    W-phase bus-bar main-body part (41)    Bus-bar case (50)