The invention provides a pump unit which can improve an waterproof effect through preventing a partitioning wall part from being stripped from a sealing part covering a conductive part, wherein the partitioning wall part partitions a pump room with the conductive part. The pump also can reduce the cost through shortening pitch time. The pump unit is provdied with the partitioning wall part (11) which partitions a rotor (4), a stator (5), and substrates (27, 28), and is also provided with the sealing part (12) which seals the stator (5) and the substrates (27, 28). An arc-shaped stripping preventing part (31) is symmetrically formed at a flange part (11c) of the partitioning wall part (11) through taking the central axis (L) of the partitioning wall part (11) as the reference. The stripping preventing part (31) is provided with an anchor bolt part (33), and there is a gap between the anchor bolt part (33) and the flange part (11c). The stripping preventing part (31) is arranged along a connection part between the flange part (11c) and the sealing part (12). The direction of the long side of the stripping preventing part (31) is a flow-in direction (X3) of resion. The flow-in direction (X3) faces to a connector (27a) fixed on the substrate (27) from a sprue trace (A).