A main bus-bar tank (2) has: a cylindrical main body section (2a) that is disposed with the central axis (3) thereof being parallel with an installation surface (30); and branch sections (6a-6c) that branch from the main body section (2a). Three-phase main bus bars (5a-5c) are all disposed inside the main body section (2a) and extend in the direction of the central axis (3). Branch bus bars (7a-7c) branch from the main bus bars (5a-5c) and are disposed in the branch sections (6a-6c). Tips parts (9a-9c) of the branch sections (6a-6c) are linearly arranged at inclined angles with respect to the direction of the central axis (3).
